Life Processes MCQs with Answers (200 Questions) | Class 10 Science NCERT & PYQ Based

200+ MCQs ko 2 parts (100+100) mein .

📘 Part 1 (Q1–Q100)

Topics Covered:

Nutrition
Human Digestive System
Respiration
Human Respiratory System
Transportation in Humans
Blood, Lymph, Heart
Transportation in Plants

📗 Part 2 (Q101–Q200)

Topics Covered:

Excretion in Humans
Excretion in Plants
Mixed Concept Questions
Assertion-Reason
Case-Based Questions
Previous Year Pattern Questions
NCERT Line-Based Traps

full chapter detail notes for board exam

https://www.learnwithafsa.online/2026/05/life-processes-class-10-notes.html

Life Processes MCQ Test (Part 1: Q1–Q20)

Q1. Which enzyme is present in saliva?

A) Pepsin B) Trypsin C) Salivary amylase D) Lipase

✅ Answer: C
📖 Salivary amylase starts digestion of starch in the mouth.

Q2. The inner lining of the stomach secretes:

A) Bile B) Gastric juice C) Pancreatic juice D) Saliva

✅ Answer: B
📖 Gastric glands secrete HCl, pepsin and mucus.

Q3. Which acid is present in gastric juice?

A) Sulphuric acid B) Nitric acid C) Hydrochloric acid D) Acetic acid

✅ Answer: C

Q4. Bile juice is produced by:

A) Pancreas B) Liver C) Stomach D) Gall bladder

✅ Answer: B

Q5. The largest gland in the human body is:

A) Pancreas B) Thyroid C) Liver D) Pituitary

✅ Answer: C

Q6. Digestion of proteins begins in:

A) Mouth B) Stomach C) Small intestine D) Large intestine

✅ Answer: B

Q7. The functional unit of kidney is:

A) Neuron B) Nephron C) Alveolus D) Villus

✅ Answer: B

Q8. Exchange of gases takes place in:

A) Trachea B) Bronchi C) Alveoli D) Larynx

✅ Answer: C

Q9. Which blood vessel carries oxygenated blood from lungs to heart?

A) Pulmonary artery B) Aorta C) Pulmonary vein D) Vena cava

✅ Answer: C

Q10. Human heart has:

A) 2 chambers B) 3 chambers C) 4 chambers D) 5 chambers

✅ Answer: C

Q11. Blood pressure is measured using:

A) Stethoscope B) Thermometer C) Sphygmomanometer D) Barometer

✅ Answer: C

Q12. Which pigment carries oxygen in blood?

A) Melanin B) Haemoglobin C) Chlorophyll D) Myoglobin

✅ Answer: B

Q13. Double circulation is found in:

A) Fish B) Frog C) Human D) Shark

✅ Answer: C

Q14. Water is transported in plants through:

A) Phloem B) Xylem C) Cortex D) Epidermis

✅ Answer: B

Q15. Food is transported in plants by:

A) Xylem B) Phloem C) Cambium D) Cortex

✅ Answer: B

Q16. The energy currency of the cell is:

A) DNA B) ATP C) RNA D) ADP

✅ Answer: B

Q17. Aerobic respiration occurs in:

A) Cytoplasm only B) Mitochondria C) Nucleus D) Ribosome

✅ Answer: B

Q18. The end products of aerobic respiration are:

A) Alcohol + CO₂ B) Lactic acid C) CO₂ + H₂O + Energy D) Glucose

✅ Answer: C

Q19. Which chamber of the heart pumps oxygenated blood to the body?

A) Right atrium B) Right ventricle C) Left atrium D) Left ventricle

✅ Answer: D

Q20. The filtration of blood occurs in:

A) Ureter B) Urinary bladder C) Nephron D) Urethra

✅ Answer: C

🔥 Important PYQ Traps

Liver produces bile; gall bladder stores it.
Pulmonary vein carries oxygenated blood (exception).
Pulmonary artery carries deoxygenated blood (exception).
Nephron = functional unit of kidney.
Alveoli = site of gas exchange.
Xylem → water transport.
Phloem → food transport
📘 Life Processes MCQs (Part 1 Continued: Q21–Q50)

NCERT Based | PYQ Pattern | Answers + Explanations

Q21. Which part of the alimentary canal is the longest?

A) Stomach
B) Oesophagus
C) Small intestine
D) Large intestine

✅ Answer: C
📖 Small intestine is about 6–7 m long and is the main site of digestion and absorption.

Q22. Villi are present in:

A) Stomach
B) Small intestine
C) Large intestine
D) Oesophagus

✅ Answer: B
📖 Villi increase the surface area for absorption of digested food.

Q23. Which enzyme digests proteins in the stomach?

A) Amylase
B) Lipase
C) Pepsin
D) Maltase

✅ Answer: C

Q24. Which nutrient is mainly digested by lipase?

A) Protein
B) Fat
C) Starch
D) Vitamins

✅ Answer: B

Q25. Anaerobic respiration in muscles produces:

A) Alcohol
B) Carbon dioxide
C) Lactic acid
D) Glucose

✅ Answer: C

Q26. The process of breaking down food to release energy is:

A) Digestion
B) Respiration
C) Circulation
D) Excretion

✅ Answer: B

Q27. The blood vessel carrying blood from heart to lungs is:

A) Aorta
B) Pulmonary artery
C) Pulmonary vein
D) Vena cava

✅ Answer: B

Q28. Which component of blood helps in clotting?

A) RBCs
B) WBCs
C) Plasma
D) Platelets

✅ Answer: D

Q29. White blood cells help in:

A) Oxygen transport
B) Blood clotting
C) Defense against infection
D) Food transport

✅ Answer: C

Q30. The liquid part of blood is:

A) Plasma
B) Serum
C) Lymph
D) Platelets

✅ Answer: A

Q31. Which chamber receives oxygenated blood from lungs?

A) Right atrium
B) Right ventricle
C) Left atrium
D) Left ventricle

✅ Answer: C

Q32. The valve between left atrium and left ventricle prevents:

A) Oxygen loss
B) Backflow of blood
C) Clotting
D) Mixing of blood

✅ Answer: B

Q33. Blood pressure of a healthy adult is approximately:

A) 80/120 mm Hg
B) 120/80 mm Hg
C) 140/100 mm Hg
D) 100/60 mm Hg

✅ Answer: B

Q34. Which tissue transports food in plants?

A) Xylem
B) Phloem
C) Epidermis
D) Cortex

✅ Answer: B

Q35. Translocation in plants occurs through:

A) Xylem
B) Phloem
C) Stomata
D) Root hairs

✅ Answer: B

Q36. Loss of water in the form of vapour from aerial parts is:

A) Respiration
B) Guttation
C) Transpiration
D) Photosynthesis

✅ Answer: C

Q37. Opening and closing of stomata is controlled by:

A) Root hairs
B) Guard cells
C) Xylem cells
D) Phloem cells

✅ Answer: B

Q38. The main nitrogenous waste in humans is:

A) Ammonia
B) Urea
C) Uric acid
D) Carbon dioxide

✅ Answer: B

Q39. Urine formation occurs in:

A) Ureter
B) Urinary bladder
C) Nephron
D) Urethra

✅ Answer: C

Q40. The tube carrying urine from kidney to bladder is:

A) Urethra
B) Nephron
C) Ureter
D) Renal artery

✅ Answer: C

Q41. The organ that stores urine is:

A) Kidney
B) Ureter
C) Urinary bladder
D) Urethra

✅ Answer: C

Q42. Which process removes metabolic wastes from the body?

A) Digestion
B) Respiration
C) Excretion
D) Circulation

✅ Answer: C

Q43. Lymph mainly functions in:

A) Oxygen transport
B) Food transport only
C) Returning tissue fluid to blood
D) Digestion

✅ Answer: C

Q44. Which blood vessel has the thickest wall?

A) Vein
B) Capillary
C) Artery
D) Venule

✅ Answer: C

Q45. Exchange of substances between blood and cells occurs through:

A) Arteries
B) Veins
C) Capillaries
D) Aorta

✅ Answer: C

Q46. Which of the following is NOT a function of blood?

A) Transport of gases
B) Transport of nutrients
C) Transport of hormones
D) Photosynthesis

✅ Answer: D

Q47. During vigorous exercise, muscles perform:

A) Only aerobic respiration
B) Only photosynthesis
C) Anaerobic respiration also
D) No respiration

✅ Answer: C

Q48. The movement of food from leaves to other parts of the plant is called:

A) Transpiration
B) Translocation
C) Absorption
D) Respiration

✅ Answer: B

Q49. Which structure prevents food from entering the windpipe?

A) Trachea
B) Bronchus
C) Epiglottis
D) Alveolus

✅ Answer: C

Q50. Which statement is correct?

A) Xylem transports food
B) Phloem transports water
C) Xylem transports water and minerals
D) Stomata transport food

✅ Answer: C

📖 Explanation: Xylem carries water and minerals from roots to aerial parts of the plant.

🎯 High-Yield NCERT Facts (Frequently Asked)

✅ Villi → Absorption of food
✅ Pepsin → Protein digestion
✅ Lipase → Fat digestion
✅ Platelets → Blood clotting
✅ Pulmonary artery → Deoxygenated blood
✅ Pulmonary vein → Oxygenated blood
✅ Nephron → Functional unit of kidney
✅ Guard cells → Control stomata
✅ Urea → Main nitrogenous waste in humans
✅ Phloem → Translocation of food
📘 Life Processes MCQs (Part 1 Continued: Q51–Q100)
NCERT Based | PYQ Pattern | Tricky Questions with Answers & Explanations
Q51. Which chamber of the heart has the thickest muscular wall?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
✅ Answer: D
📖 Left ventricle pumps blood to the entire body, so it has the thickest wall.
Q52. Which blood vessel carries oxygenated blood to all body parts?
A) Pulmonary artery
B) Aorta
C) Vena cava
D) Pulmonary vein
✅ Answer: B
Q53. The respiratory pigment present in RBCs is:
A) Chlorophyll
B) Myoglobin
C) Haemoglobin
D) Melanin
✅ Answer: C
Q54. Which process occurs in alveoli?
A) Digestion
B) Gas exchange
C) Filtration
D) Absorption of nutrients
✅ Answer: B
Q55. The opening of stomata is mainly due to:
A) Shrinkage of guard cells
B) Turgidity of guard cells
C) Death of guard cells
D) Growth of xylem
✅ Answer: B
Q56. Which of the following is an excretory product in plants?
A) Oxygen
B) Resins
C) Gums
D) All of these
✅ Answer: D
Q57. The process of taking in oxygen and giving out carbon dioxide is:
A) Digestion
B) Breathing
C) Excretion
D) Circulation
✅ Answer: B
Q58. The actual breakdown of food to release energy occurs during:
A) Breathing
B) Ventilation
C) Respiration
D) Transpiration
✅ Answer: C
Q59. Which organ secretes bile?
A) Gall bladder
B) Liver
C) Pancreas
D) Stomach
✅ Answer: B
Q60. Gall bladder mainly functions to:
A) Produce bile
B) Store bile
C) Digest fats
D) Absorb glucose
✅ Answer: B
Q61. Pancreatic juice contains enzymes for digestion of:
A) Carbohydrates only
B) Proteins only
C) Fats only
D) Carbohydrates, proteins and fats
✅ Answer: D
Q62. Which structure prevents backflow of blood in veins?
A) Septum
B) Valves
C) Platelets
D) Capillaries
✅ Answer: B
Q63. The separation between right and left sides of the heart is due to:
A) Valve
B) Septum
C) Aorta
D) Atrium
✅ Answer: B
Q64. Which of the following does NOT contain blood?
A) Artery
B) Vein
C) Capillary
D) Trachea
✅ Answer: D
Q65. Which gas is transported mainly by haemoglobin?
A) Nitrogen
B) Oxygen
C) Hydrogen
D) Helium
✅ Answer: B
Q66. Root pressure helps in:
A) Food transport
B) Water movement upward
C) Photosynthesis
D) Respiration
✅ Answer: B
Q67. Which part of nephron performs filtration?
A) Loop of Henle
B) Collecting duct
C) Bowman's capsule and glomerulus
D) Ureter
✅ Answer: C
Q68. Reabsorption of useful substances occurs mainly in:
A) Urethra
B) Tubules of nephron
C) Urinary bladder
D) Ureter
✅ Answer: B
Q69. Assertion (A): Arteries have thick elastic walls.
Reason (R): Blood flows through them under high pressure.
A) Both true and R explains A
B) Both true but R doesn't explain A
C) A true, R false
D) A false, R true
✅ Answer: A
Q70. Assertion (A): Veins have valves.
Reason (R): Blood pressure in veins is low.
A) Both true and R explains A
B) Both true but R doesn't explain A
C) A true, R false
D) A false, R true
✅ Answer: A
Q71. Which blood group is called the universal donor?
A) A
B) B
C) AB
D) O
✅ Answer: D
Q72. Which blood group is called the universal recipient?
A) O
B) AB
C) A
D) B
✅ Answer: B
Q73. The contraction of the heart is called:
A) Diastole
B) Systole
C) Diffusion
D) Osmosis
✅ Answer: B
Q74. The relaxation phase of heart is:
A) Systole
B) Diastole
C) Respiration
D) Ventilation
✅ Answer: B
Q75. Which of the following transports minerals from roots?
A) Phloem
B) Xylem
C) Stomata
D) Cortex
✅ Answer: B
Q76. In humans, digestion is completed in:
A) Mouth
B) Stomach
C) Small intestine
D) Large intestine
✅ Answer: C
Q77. Which vitamin is produced by bacteria in the large intestine?
A) Vitamin A
B) Vitamin C
C) Vitamin K
D) Vitamin D
✅ Answer: C
Q78. The absorption of water mainly occurs in:
A) Stomach
B) Small intestine
C) Large intestine
D) Oesophagus
✅ Answer: C
Q79. Which process requires ATP?
A) Diffusion only
B) Osmosis only
C) Active transport
D) Evaporation
✅ Answer: C
Q80. Food moves through oesophagus by:
A) Diffusion
B) Peristalsis
C) Osmosis
D) Filtration
✅ Answer: B
Q81. Which of the following is NOT a digestive enzyme?
A) Pepsin
B) Trypsin
C) Lipase
D) Bile
✅ Answer: D
📖 Bile helps emulsify fats but is not an enzyme.
Q82. Emulsification of fats occurs in:
A) Stomach
B) Mouth
C) Small intestine
D) Large intestine
✅ Answer: C
Q83. Which structure increases absorption area in the small intestine?
A) Alveoli
B) Villi
C) Nephrons
D) Bronchi
✅ Answer: B
Q84. The transport of oxygen in blood is mainly done by:
A) Plasma
B) WBCs
C) RBCs
D) Platelets
✅ Answer: C
Q85. Which component fights infection?
A) RBCs
B) WBCs
C) Platelets
D) Plasma
✅ Answer: B
Q86. Which structure filters blood in kidney?
A) Alveolus
B) Villus
C) Glomerulus
D) Atrium
✅ Answer: C
Q87. The blood entering kidneys is carried by:
A) Renal vein
B) Renal artery
C) Ureter
D) Urethra
✅ Answer: B
Q88. Which organ removes excess water and salts?
A) Heart
B) Liver
C) Kidney
D) Pancreas
✅ Answer: C
Q89. The process of losing water vapour through stomata is:
A) Guttation
B) Respiration
C) Transpiration
D) Digestion
✅ Answer: C
Q90. Which force is mainly responsible for ascent of sap?
A) Gravity
B) Transpiration pull
C) Diffusion
D) Osmosis
✅ Answer: B
Q91. The exchange of gases in plants occurs mainly through:
A) Xylem
B) Phloem
C) Stomata and lenticels
D) Roots only
✅ Answer: C
Q92. Which process removes CO₂ from the body?
A) Digestion
B) Exhalation
C) Circulation
D) Filtration
✅ Answer: B
Q93. Which organ is common to both digestive and respiratory systems?
A) Pharynx
B) Stomach
C) Alveoli
D) Liver
✅ Answer: A
Q94. During inhalation, ribs move:
A) Downward and inward
B) Upward and outward
C) Downward and outward
D) No movement
✅ Answer: B
Q95. During exhalation, diaphragm becomes:
A) Flat
B) Contracted
C) Dome-shaped
D) Enlarged
✅ Answer: C
Q96. Which of the following is correctly matched?
A) Xylem – Food transport
B) Phloem – Water transport
C) Nephron – Kidney unit
D) Alveoli – Digestion
✅ Answer: C
Q97. Which life process is essential for obtaining energy from food?
A) Excretion
B) Respiration
C) Transportation
D) Transpiration
✅ Answer: B
Q98. Blood is a type of:
A) Epithelial tissue
B) Connective tissue
C) Nervous tissue
D) Muscular tissue
✅ Answer: B
Q99. Which one is the correct sequence of urine flow?
A) Kidney → Ureter → Urinary Bladder → Urethra
B) Kidney → Urethra → Ureter → Bladder
C) Ureter → Kidney → Bladder → Urethra
D) Kidney → Bladder → Ureter → Urethra
✅ Answer: A
Q100. Which statement is correct?
A) Phloem transports water only
B) Xylem transports food only
C) Nephron is the functional unit of kidney
D) Alveoli are present in heart
✅ Answer: C
📖 Explanation: Nephron is the structural and functional unit of the kidney and is one of the most frequently asked NCERT facts.
🚀 Quick Revision of Most Repeated PYQs
- Nephron = Functional unit of kidney
- Alveoli = Site of gas exchange
- Villi = Site of absorption
- Pepsin = Protein digestion
- Bile = Emulsification of fats
- Xylem = Water & mineral transport
- Phloem = Food transport
- Left ventricle = Thickest chamber
- Pulmonary vein = Oxygenated blood
- Pulmonary artery = Deoxygenated blood
- Transpiration pull = Ascent of sap
- RBC = Oxygen transport
- WBC = Immunity
- Platelets = Clotting
📗 Life Processes MCQs (Part 2: Q101–Q150)

NCERT Based | PYQ-Inspired | Assertion-Reason | Tricky Questions

Q101. Assertion (A): Photosynthesis and respiration are complementary processes.

Reason (R): Products of one are raw materials for the other.

A) Both A and R are true and R explains A
B) Both true but R doesn't explain A
C) A true, R false
D) A false, R true

✅ Answer: A

📖 Products of photosynthesis (glucose, O₂) are used in respiration, while CO₂ and H₂O from respiration are used in photosynthesis.

Q102. Which of the following is absorbed without digestion?

A) Proteins
B) Starch
C) Vitamins
D) Fats

✅ Answer: C

Q103. Which part of alimentary canal receives bile and pancreatic juice?

A) Stomach
B) Duodenum
C) Ileum
D) Colon

✅ Answer: B

Q104. The semi-digested food leaving the stomach is called:

A) Bolus
B) Chyme
C) Faeces
D) Plasma

✅ Answer: B

Q105. Which enzyme converts starch into maltose?

A) Lipase
B) Pepsin
C) Amylase
D) Trypsin

✅ Answer: C

Q106. Assertion (A): Human heart prevents mixing of oxygenated and deoxygenated blood.

Reason (R): Human heart is four-chambered.

A) Both true and R explains A
B) Both true but R doesn't explain A
C) A true, R false
D) A false, R true

✅ Answer: A

Q107. Which chamber receives deoxygenated blood from the body?

A) Left atrium
B) Left ventricle
C) Right atrium
D) Right ventricle

✅ Answer: C

Q108. Which vessel carries blood from right ventricle to lungs?

A) Aorta
B) Pulmonary artery
C) Pulmonary vein
D) Vena cava

✅ Answer: B

Q109. Blood consists of:

A) Plasma only
B) RBCs only
C) Plasma and blood cells
D) Platelets only

✅ Answer: C

Q110. Which component transports hormones?

A) RBCs
B) Plasma
C) Platelets
D) WBCs

✅ Answer: B

Q111. Which structure in plants is mainly responsible for water absorption?

A) Root cap
B) Root hairs
C) Cortex
D) Phloem

✅ Answer: B

Q112. Transpiration helps in:

A) Photosynthesis only
B) Water absorption only
C) Ascent of sap and cooling
D) Digestion

✅ Answer: C

Q113. Which nitrogenous waste requires maximum water for excretion?

A) Urea
B) Uric acid
C) Ammonia
D) Creatinine

✅ Answer: C

Q114. Human beings are:

A) Ammonotelic
B) Uricotelic
C) Ureotelic
D) None

✅ Answer: C

Q115. Which process is responsible for movement of food through alimentary canal?

A) Diffusion
B) Osmosis
C) Peristalsis
D) Filtration

✅ Answer: C

Q116. The epiglottis prevents food from entering:

A) Oesophagus
B) Trachea
C) Stomach
D) Intestine

✅ Answer: B

Q117. Which digestive juice does not contain enzymes?

A) Saliva
B) Gastric juice
C) Bile juice
D) Pancreatic juice

✅ Answer: C

Q118. Bile helps in digestion by:

A) Breaking proteins
B) Breaking starch
C) Emulsifying fats
D) Producing glucose

✅ Answer: C

Q119. The blood leaving kidneys through renal vein is:

A) Purified blood
B) Oxygen-free blood only
C) Undigested blood
D) Lymph

✅ Answer: A

Q120. Which structure is known as the filtration unit of kidney?

A) Neuron
B) Nephron
C) Villus
D) Alveolus

✅ Answer: B

Q121. Assertion (A): Veins carry blood toward the heart.

Reason (R): Veins always carry deoxygenated blood.

A) A true, R false
B) A false, R true
C) Both true
D) Both false

✅ Answer: A

📖 Pulmonary vein carries oxygenated blood.

Q122. Which process releases the highest amount of energy?

A) Anaerobic respiration
B) Fermentation
C) Aerobic respiration
D) Digestion

✅ Answer: C

Q123. ATP is synthesized mainly in:

A) Ribosomes
B) Nucleus
C) Mitochondria
D) Golgi body

✅ Answer: C

Q124. Which gas is released during photosynthesis?

A) CO₂
B) O₂
C) N₂
D) H₂

✅ Answer: B

Q125. The normal lifespan of human RBCs is about:

A) 12 days
B) 60 days
C) 120 days
D) 240 days

✅ Answer: C

Q126. Which blood cells lack nucleus in humans?

A) WBCs
B) RBCs
C) Platelets only
D) Lymphocytes

✅ Answer: B

Q127. Which blood cells directly help in immunity?

A) RBCs
B) WBCs
C) Platelets
D) Plasma

✅ Answer: B

Q128. Which vessel has the lowest blood pressure?

A) Aorta
B) Arteries
C) Veins
D) Capillaries

✅ Answer: C

Q129. The movement of molecules from high concentration to low concentration is:

A) Osmosis
B) Diffusion
C) Active transport
D) Filtration

✅ Answer: B

Q130. Osmosis is movement of:

A) Solute molecules
B) Water molecules
C) Minerals only
D) Food only

✅ Answer: B

Q131. Which tissue transports food in both directions?

A) Xylem
B) Phloem
C) Epidermis
D) Cork

✅ Answer: B

Q132. Water transport in xylem is generally:

A) Bidirectional
B) Multidirectional
C) Upward only
D) Downward only

✅ Answer: C

Q133. Which organ removes carbon dioxide?

A) Kidney
B) Skin
C) Lungs
D) Liver

✅ Answer: C

Q134. Sweat glands help in:

A) Digestion
B) Excretion and temperature regulation
C) Respiration
D) Circulation

✅ Answer: B

Q135. Which is NOT a function of liver?

A) Bile secretion
B) Detoxification
C) Storage of glycogen
D) Urine formation

✅ Answer: D

Q136. The opening of stomata occurs when guard cells become:

A) Flaccid
B) Dead
C) Turgid
D) Dry

✅ Answer: C

Q137. Which process helps maintain water balance in plants?

A) Digestion
B) Transpiration
C) Fermentation
D) Excretion

✅ Answer: B

Q138. Which structure prevents mixing of blood in humans?

A) Atrium
B) Septum
C) Valve
D) Capillary

✅ Answer: B

Q139. Double circulation means blood passes through the heart:

A) Once in one cycle
B) Twice in one cycle
C) Thrice in one cycle
D) Four times in one cycle

✅ Answer: B

Q140. Which process forms urine?

A) Filtration, reabsorption, secretion
B) Digestion, absorption, assimilation
C) Respiration, diffusion, excretion
D) Ventilation, diffusion, circulation

✅ Answer: A

Q141. Which part of nephron is cup-shaped?

A) Loop of Henle
B) Bowman's capsule
C) Collecting duct
D) Ureter

✅ Answer: B

Q142. Excess amino acids are converted into:

A) Glucose only
B) Urea and other products
C) Vitamins
D) Starch

✅ Answer: B

Q143. The largest amount of digestion occurs in:

A) Mouth
B) Stomach
C) Small intestine
D) Large intestine

✅ Answer: C

Q144. Which enzyme acts in acidic medium?

A) Pepsin
B) Amylase
C) Trypsin
D) Lipase

✅ Answer: A

Q145. Which enzyme acts in alkaline medium?

A) Pepsin
B) Trypsin
C) HCl
D) Mucus

✅ Answer: B

Q146. Which process is directly responsible for absorption of water by roots?

A) Diffusion
B) Osmosis
C) Respiration
D) Photosynthesis

✅ Answer: B

Q147. Which component of blood helps transport nutrients?

A) Plasma
B) RBCs
C) Platelets
D) WBCs

✅ Answer: A

Q148. Which organ system is directly responsible for removal of metabolic wastes?

A) Digestive system
B) Respiratory system
C) Excretory system
D) Circulatory system

✅ Answer: C

Q149. The main excretory organ in humans is:

A) Liver
B) Skin
C) Kidney
D) Lung

✅ Answer: C

Q150. Which statement is CORRECT?

A) Xylem transports food
B) Phloem transports minerals only
C) Nephron is the structural and functional unit of kidney
D) Alveoli are present in stomach

✅ Answer: C

📖.📘 Life Processes MCQs (Part 2 Continued: Q151–Q200)

NCERT Based | PYQ Pattern | Assertion-Reason | HOTS Questions

---

Q151. Which blood vessel carries deoxygenated blood from the body to the heart?

A) Aorta

B) Pulmonary vein

C) Vena cava

D) Pulmonary artery

✅ Answer: C

📖 Vena cava brings deoxygenated blood into the right atrium.

---

Q152. The valve present between right atrium and right ventricle is:

A) Bicuspid valve

B) Tricuspid valve

C) Semilunar valve

D) Mitral valve

✅ Answer: B

---

Q153. Which of the following has the thinnest wall?

A) Artery

B) Vein

C) Capillary

D) Aorta

✅ Answer: C

📖 Capillaries are one-cell thick for efficient exchange.

---

Q154. The process by which cells utilize oxygen to release energy is:

A) Breathing

B) Digestion

C) Cellular respiration

D) Ventilation

✅ Answer: C

---

Q155. During inhalation:

A) Chest cavity volume decreases

B) Ribs move downward

C) Diaphragm contracts

D) Lungs shrink

✅ Answer: C

---

Q156. During exhalation:

A) Diaphragm contracts

B) Chest cavity expands

C) Diaphragm relaxes

D) Oxygen enters blood

✅ Answer: C

---

Q157. Which of the following is NOT transported by blood?

A) Oxygen

B) Hormones

C) Nutrients

D) Chlorophyll

✅ Answer: D

---

Q158. The pressure exerted by blood on artery walls is called:

A) Osmotic pressure

B) Root pressure

C) Blood pressure

D) Diffusion pressure

✅ Answer: C

---

Q159. A person with low haemoglobin is likely suffering from:

A) Diabetes

B) Anaemia

C) Hypertension

D) Asthma

✅ Answer: B

---

Q160. Which structure in plants regulates gaseous exchange?

A) Xylem

B) Phloem

C) Stomata

D) Cortex

✅ Answer: C

---

Q161. Assertion (A): Xylem consists mainly of dead cells.

Reason (R): Dead cells provide efficient water conduction.

A) Both true and R explains A

B) Both true but R doesn't explain A

C) A true, R false

D) A false, R true

✅ Answer: A

---

Q162. Which tissue contains sieve tubes?

A) Xylem

B) Phloem

C) Epidermis

D) Cortex

✅ Answer: B

---

Q163. The transport of soluble products of photosynthesis is called:

A) Translocation

B) Transpiration

C) Diffusion

D) Respiration

✅ Answer: A

---

Q164. Which organ removes excess salts and water through sweat?

A) Kidney

B) Lung

C) Skin

D) Liver

✅ Answer: C

---

Q165. The waste product excreted by lungs is:

A) Urea only

B) Carbon dioxide and water vapour

C) Uric acid

D) Ammonia

✅ Answer: B

---

Q166. Which of the following is an example of anaerobic respiration?

A) Respiration in human muscles during vigorous exercise

B) Respiration in lungs

C) Respiration in leaves

D) Respiration in roots

✅ Answer: A

---

Q167. The energy released during respiration is stored in:

A) DNA

B) ATP

C) RNA

D) Protein

✅ Answer: B

---

Q168. Which part of digestive system absorbs most nutrients?

A) Stomach

B) Large intestine

C) Small intestine

D) Rectum

✅ Answer: C

---

Q169. Which enzyme digests proteins in the small intestine?

A) Amylase

B) Trypsin

C) Lipase

D) Maltase

✅ Answer: B

---

Q170. The pH of stomach is acidic due to:

A) Bile

B) HCl

C) Saliva

D) Water

✅ Answer: B

---

Q171. Which statement is true?

A) Arteries always carry oxygenated blood

B) Veins always carry deoxygenated blood

C) Pulmonary artery carries deoxygenated blood

D) Pulmonary vein carries deoxygenated blood

✅ Answer: C

📖 This is one of the most common NCERT traps.

---

Q172. The main function of platelets is:

A) Oxygen transport

B) Immunity

C) Blood clotting

D) Nutrient transport

✅ Answer: C

---

Q173. Which component of blood contains antibodies?

A) RBCs

B) WBCs and plasma

C) Platelets

D) Haemoglobin

✅ Answer: B

---

Q174. Blood group AB is called:

A) Universal donor

B) Universal recipient

C) Rare group

D) Rh-negative group

✅ Answer: B

---

Q175. Which of the following is not a blood vessel?

A) Aorta

B) Ureter

C) Vein

D) Capillary

✅ Answer: B

---

Q176. The opening and closing of stomata depend on:

A) Root pressure

B) Guard cells

C) Xylem pressure

D) Phloem pressure

✅ Answer: B

---

Q177. Which mineral is essential for haemoglobin formation?

A) Calcium

B) Iron

C) Sodium

D) Potassium

✅ Answer: B

---

Q178. The movement of water through a semipermeable membrane is:

A) Diffusion

B) Osmosis

C) Active transport

D) Translocation

✅ Answer: B

---

Q179. The blood pressure in arteries is:

A) Lower than veins

B) Equal to veins

C) Higher than veins

D) Zero

✅ Answer: C

---

Q180. Which chamber pumps blood into the aorta?

A) Right atrium

B) Left atrium

C) Right ventricle

D) Left ventricle

✅ Answer: D

---

Q181. Assertion (A): Small intestine is highly coiled.

Reason (R): It increases surface area for digestion and absorption.

A) Both true and R explains A

B) Both true but R doesn't explain A

C) A true, R false

D) A false, R true

✅ Answer: A

---

Q182. Which organ stores glycogen?

A) Heart

B) Liver

C) Kidney

D) Lung

✅ Answer: B

---

Q183. The liquid filtered from blood into Bowman's capsule is called:

A) Urine

B) Plasma

C) Glomerular filtrate

D) Lymph

✅ Answer: C

---

Q184. Which process removes nitrogenous wastes?

A) Digestion

B) Respiration

C) Excretion

D) Circulation

✅ Answer: C

---

Q185. Which of the following is NOT part of nephron?

A) Bowman's capsule

B) Loop of Henle

C) Glomerulus

D) Alveolus

✅ Answer: D

---

Q186. In plants, excess water is lost mainly through:

A) Roots

B) Stem

C) Stomata

D) Phloem

✅ Answer: C

---

Q187. Which life process provides energy for all cellular activities?

A) Digestion

B) Respiration

C) Excretion

D) Transportation

✅ Answer: B

---

Q188. The movement of food in phloem requires:

A) ATP

B) Sunlight only

C) Oxygen only

D) No energy

✅ Answer: A

---

Q189. Which organ is called the "master chemical factory" of the body?

A) Heart

B) Liver

C) Kidney

D) Stomach

✅ Answer: B

---

Q190. Which structure increases gas exchange surface in lungs?

A) Bronchi

B) Trachea

C) Alveoli

D) Larynx

✅ Answer: C

---

Q191. Which process is responsible for movement of water from roots to leaves?

A) Translocation

B) Transpiration pull

C) Digestion

D) Excretion

✅ Answer: B

---

Q192. The human heart is made of:

A) Smooth muscle

B) Skeletal muscle

C) Cardiac muscle

D) Connective tissue

✅ Answer: C

---

Q193. Which organ secretes insulin?

A) Liver

B) Pancreas

C) Kidney

D) Stomach

✅ Answer: B

---

Q194. Which of the following is a function of plasma?

A) Transport dissolved substances

B) Clot blood directly

C) Produce antibodies only

D) Carry oxygen only

✅ Answer: A

---

Q195. The waste product formed by breakdown of proteins is mainly:

A) Urea

B) Glucose

C) Oxygen

D) Glycogen

✅ Answer: A

---

Q196. Which structure separates thoracic and abdominal cavities?

A) Pleura

B) Diaphragm

C) Pericardium

D) Trachea

✅ Answer: B

---

Q197. Which process occurs continuously in living cells?

A) Digestion only

B) Respiration

C) Excretion only

D) Transportation only

✅ Answer: B

---

Q198. Which of the following correctly matches the process and site?

A) Filtration — Alveoli

B) Gas exchange — Nephron

C) Digestion — Small intestine

D) Respiration — Stomach

✅ Answer: C

---

Q199. The primary function of xylem is:

A) Food transport

B) Water and mineral transport

C) Gas exchange

D) Storage

✅ Answer: B

---

Q200. Which statement is CORRECT?

A) Phloem transports food from leaves to other parts of plant

B) Xylem transports prepared food

C) Alveoli are present in kidneys

D) Nephrons are present in lungs

✅ Answer: A

📖 Final NCERT PYQ Trap:

Xylem → Water & Minerals

Phloem → Food (Translocation)

🎯 Life Processes Final Revision (Must Memorize)

Villi → Absorption

Alveoli → Gas Exchange

Nephron → Functional Unit of Kidney

Xylem → Water Transport

Phloem → Food Transport

RBC → Oxygen Transport

WBC → Immunity

Platelets → Clotting

Pulmonary Artery → Deoxygenated Blood

Pulmonary Vein → Oxygenated Blood

ATP → Energy Currency

Pepsin → Protein Digestion

Lipase → Fat Digestion

Amylase → Starch Digestion

Urea → Main Nitrogenous Waste in Humans

🎉 Q1–Q200 complete. These cover the most important NCERT concepts, board-style questions, and PYQ-inspired traps from the Life Processes chapter.

Control and coordination chapter

https://www.learnwithafsa.online/2026/05/class-10-notes-cbse.html

How do organisms reproduce

https://www.learnwithafsa.online/2026/05/how-do-organisms-reproduce-class-10-notes.html

Class 10 Biology Heredity and Evolution Notes | CBSE Board 2026 NCERT PYQ, Diagrams & Important Questions

🧬 Class 10 Biology — Heredity and Evolution Complete Detailed Notes

CBSE Board 2026 | NCERT Based | PYQs | Important Questions | Tricks | Diagrams | Board Answers

📖 Introduction

Living organisms produce offspring that resemble their parents. This happens because traits are passed from one generation to another. This transmission of traits is called heredity.

At the same time, small differences also appear among organisms. These differences are called variations. Variations accumulate over generations and lead to evolution.

🌟 Important Definitions

Term	Definition
Heredity	Transmission of traits from parents to offspring
Variation	Differences among individuals of same species
Evolution	Gradual change in organisms over generations
Trait	A characteristic feature
Gene	Functional unit of heredity
Chromosome	Thread-like structure carrying genes

🌟 Why Are Variations Important?

Variations are important because they:

Help organisms adapt to changing environment
Increase chances of survival
Form basis of evolution

🌟 Types of Variations

Type	Example
Useful variation	Long neck in giraffe
Harmful variation	Genetic disease
Neutral variation	Different eye colour

🧬 Heredity

Heredity is the process by which characteristics are transferred from parents to offspring through genes.

🌟 Examples of Hereditary Traits

Eye colour
Hair colour
Blood group
Height

🌟 Acquired Traits

Traits developed during an individual’s lifetime due to environmental effects or habits are called acquired traits.

Examples:

Bodybuilding muscles
Pierced ears
Learning skills

Acquired traits are not inherited because they do not affect genes.

🌟 Genes

Genes are small segments of DNA present on chromosomes that control traits.

🌟 DNA

Full Form:

Deoxyribonucleic Acid

DNA contains hereditary information.

🌟 Chromosomes

Chromosomes are thread-like structures present in nucleus carrying genes.

Humans have:

46 chromosomes
23 pairs of chromosomes

🧬 Gregor Mendel and His Experiments

Gregor Mendel is known as the Father of Genetics.

He performed experiments on pea plants to study inheritance.

🌟 Why Did Mendel Choose Pea Plants?

Reasons:

Short life cycle
Easily visible contrasting traits
Naturally self-pollinating
Easy to grow

🌟 Contrasting Traits Studied by Mendel

Character	Dominant Trait	Recessive Trait
Height	Tall	Dwarf
Seed shape	Round	Wrinkled
Seed colour	Yellow	Green
Flower colour	Violet	White

🌟 Important Terms

Term	Meaning
Dominant trait	Trait expressed in F₁ generation
Recessive trait	Trait hidden in F₁ generation
Genotype	Genetic makeup
Phenotype	Physical appearance

🧬 Monohybrid Cross ⭐ Very Important

A cross involving only one pair of contrasting characters is called monohybrid cross.

Example:

Tall plant × Dwarf plant

🌟 Monohybrid Cross Diagram

🌟 Mendel’s Experiment

Parent Generation:

Tall plant (TT) × Dwarf plant (tt)

🌟 F₁ Generation

All offspring were tall (Tt).

This showed that:

Tallness is dominant
Dwarfness is recessive

🌟 F₂ Generation

When F₁ plants self-pollinated:

Ratio obtained:

3 Tall : 1 Dwarf

🌟 Law of Dominance

In a pair of contrasting traits, only one trait expresses itself in F₁ generation. This is called dominant trait.

🌟 Law of Segregation

Traits separate during formation of gametes and reunite during fertilization.

🧬 Dihybrid Cross

Cross involving two pairs of contrasting characters.

Example:

Round yellow seeds × wrinkled green seeds

🌟 Dihybrid Ratio

9 : 3 : 3 : 1

🌟 Sex Determination in Humans ⭐

Sex determination is the process by which sex of a child is determined.

🌟 Human Chromosomes

Humans have:

22 pairs of autosomes
1 pair of sex chromosomes

🌟 Sex Chromosomes

Gender	Chromosomes
Male	XY
Female	XX

🌟 Sex Determination Diagram

🌟 How Is Sex Determined?

Mother always contributes X chromosome.

Father contributes:

X chromosome → Girl (XX)
Y chromosome → Boy (XY)

Therefore, the father determines the sex of the child.

🌟 Important NCERT Point ⭐

The probability of getting a boy or girl is 50%.

🌍 Evolution

Evolution means gradual change in organisms over millions of years.

🌟 Causes of Evolution

Variations
Natural selection
Genetic drift
Geographical isolation

🌟 Charles Darwin and Natural Selection

Charles Darwin proposed the theory of natural selection.

🌟 Natural Selection

Organisms with favourable variations survive and reproduce better.

This is called “Survival of the Fittest”.

🌟 Speciation

Formation of new species from existing species.

🌟 Factors Leading to Speciation

1. Geographical Isolation

Physical barriers separate populations.

Examples:

Mountains
Rivers
Seas

2. Genetic Drift

Random changes in gene frequency.

3. Natural Selection

Environment selects organisms with useful variations.

🌟 Evolution and Classification

Organisms with similar characteristics are grouped together because they share common ancestry.

🌟 Homologous Organs ⭐

Organs having:

Same basic structure
Same origin
Different functions

Examples:

Human arm
Whale fin
Bat wing

These provide evidence for divergent evolution.

🌟 Homologous Organs Diagram

🌟 Analogous Organs ⭐

Organs having:

Different structure
Different origin
Same function

Example:

Wings of bird
Wings of insect

These provide evidence for convergent evolution.

🌟 Analogous Organs Diagram

🌟 Fossils ⭐ Very Important

Fossils are preserved remains or traces of ancient organisms.

🌟 Importance of Fossils

Provide evidence of evolution
Help determine age of organisms
Show extinct species
Help study evolutionary history

🌟 Fossil Diagram

🌟 Evolution by Stages

Complex organs evolved gradually over time.

Example:

Evolution of eye

🌟 Human Evolution

Modern humans evolved from ape-like ancestors over millions of years.

🔥 Important Differences

Acquired Trait vs Inherited Trait

Acquired Trait	Inherited Trait
Develops during life	Present from birth
Not inherited	Inherited
Example: Muscles	Example: Eye colour

Homologous vs Analogous Organs

Homologous Organs	Analogous Organs
Same origin	Different origin
Different functions	Same functions
Divergent evolution	Convergent evolution

Dominant Trait vs Recessive Trait

Dominant Trait	Recessive Trait
Expressed in F₁ generation	Hidden in F₁ generation
Represented by capital letter	Represented by small letter

🎯 Most Important Board Questions with Answers

Q1. Why is Mendel called the Father of Genetics?

Answer:

Gregor Mendel performed experiments on pea plants and explained the basic laws of inheritance. Therefore, he is called the Father of Genetics.

Q2. What are homologous organs? Give examples.

Answer:

Homologous organs are organs having similar basic structure and origin but different functions.

Examples:

Human arm, whale fin and bat wing.

Q3. Why are variations important?

Answer:

Variations help organisms adapt to changing environmental conditions and increase chances of survival.

Q4. Explain sex determination in humans.

Answer:

Humans have XX chromosomes in females and XY chromosomes in males.

Mother always contributes X chromosome while father contributes either X or Y chromosome.

XX → Female child
XY → Male child

Therefore, father determines the sex of the child.

Q5. What are fossils? Mention their importance.

Answer:

Fossils are preserved remains or impressions of ancient organisms.

Importance:

Provide evidence of evolution
Help study extinct organisms
Show evolutionary relationships

🔥 Important NCERT Points

Acquired traits are not inherited.
Variations are important for survival.
Fossils provide evidence for evolution.
Sex determination depends on father.
Homologous organs indicate common ancestry.

🧠 Super Tricks

Genetics Terms:

“GCD”

Gene
Chromosome
DNA

Mendel Ratios:

Monohybrid → 3:1
Dihybrid → 9:3:3:1

Human Chromosomes:

“22 + 1”

22 pairs autosomes
1 pair sex chromosomes

✍️ Most Important Diagrams for Boards

Monohybrid cross
Sex determination
Homologous organs
Analogous organs
Fossils

🎯 Expected Questions for CBSE Board 2026

Explain Mendel’s monohybrid cross.
What are homologous organs?
Explain sex determination in humans.
Differentiate inherited and acquired traits.
What are fossils?
Explain natural selection.
Why are variations important?
Differentiate homologous and analogous organs.
Evolution (Class 10 Science) – 20 Important MCQs

1. Evolution means: A) Growth of an organism
B) Gradual change in living organisms over generations
C) Reproduction
D) Respiration
✅ Answer: B

2. The theory of Natural Selection was proposed by: A) Lamarck
B) Mendel
C) Darwin
D) Aristotle
✅ Answer: C

3. Evolution is supported by: A) Fossils
B) Comparative anatomy
C) Embryology
D) All of these
✅ Answer: D

4. Fossils are: A) Living organisms
B) Preserved remains of ancient organisms
C) Rocks only
D) Minerals only
✅ Answer: B

5. The age of fossils can be determined by: A) Carbon dating
B) Litmus test
C) Titration
D) Distillation
✅ Answer: A

6. Homologous organs indicate: A) Common ancestry
B) Different ancestry
C) No relation
D) Extinction
✅ Answer: A

7. Forelimbs of humans, whales and bats are examples of: A) Analogous organs
B) Homologous organs
C) Vestigial organs
D) Fossils
✅ Answer: B

8. Wings of birds and insects are: A) Homologous organs
B) Analogous organs
C) Fossils
D) Embryos
✅ Answer: B

9. Darwin's theory is based on: A) Mutation
B) Natural Selection
C) Cloning
D) Hybridization
✅ Answer: B

10. "Survival of the Fittest" was associated with: A) Darwin's theory
B) Cell theory
C) Germ theory
D) Atomic theory
✅ Answer: A

11. According to Lamarck, giraffes developed long necks due to: A) Natural selection
B) Use and disuse of organs
C) Mutation only
D) Fossil evidence
✅ Answer: B

12. Variations are important because they: A) Cause extinction only
B) Help in adaptation and evolution
C) Stop reproduction
D) Prevent survival
✅ Answer: B

13. Evolution occurs through: A) Sudden creation
B) Gradual accumulation of variations
C) Magic
D) Chance only
✅ Answer: B

14. Human evolution suggests humans evolved from: A) Modern monkeys
B) Ape-like ancestors
C) Fish
D) Birds
✅ Answer: B

15. Which is NOT evidence of evolution? A) Fossils
B) Embryology
C) Comparative anatomy
D) Photosynthesis
✅ Answer: D

16. The branch of science dealing with fossils is called: A) Ecology
B) Paleontology
C) Cytology
D) Anatomy
✅ Answer: B

17. Which statement is correct? A) Evolution occurs in a single generation.
B) Evolution is a slow process.
C) Evolution stops after species formation.
D) Evolution occurs only in animals.
✅ Answer: B

18. Analogous organs have: A) Same origin, different function
B) Different origin, same function
C) Same origin, same function
D) No function
✅ Answer: B

19. Fossils found in deeper rock layers are generally: A) Newer
B) Older
C) Larger
D) Smaller
✅ Answer: B

20. The ultimate source of variation is: A) Mutation
B) Digestion
C) Respiration
D) Excretion
✅ Answer: A

Score Card
- 18–20 = NEET/Board Level Excellent 🔥
- 15–17 = Very Good ✅
- 10–14 = Good 👍
- Below 10 = Revise Evolution Again
- Evolution (Class 10 Science) – Next 20 Tricky MCQs 🔥
  
  21. Which of the following provides the strongest evidence for evolution? A) Respiration
  B) Fossils
  C) Nutrition
  D) Excretion
  ✅ Answer: B
  
  22. The term "speciation" refers to: A) Extinction of species
  B) Formation of new species
  C) Migration of species
  D) Adaptation only
  ✅ Answer: B
  
  23. Variations that help an organism survive are called: A) Harmful variations
  B) Neutral variations
  C) Adaptive variations
  D) Vestigial variations
  ✅ Answer: C
  
  24. Archaeopteryx is considered a connecting link between: A) Fish and Amphibians
  B) Reptiles and Birds
  C) Mammals and Birds
  D) Reptiles and Mammals
  ✅ Answer: B
  
  25. Which scientist proposed inheritance of acquired characters? A) Darwin
  B) Lamarck
  C) Mendel
  D) Morgan
  ✅ Answer: B
  
  26. The wings of a bat and the wings of a bird are: A) Analogous organs
  B) Homologous organs
  C) Vestigial organs
  D) Rudimentary organs
  ✅ Answer: B
  
  27. Which of the following is a vestigial organ in humans? A) Heart
  B) Lungs
  C) Appendix
  D) Kidney
  ✅ Answer: C
  
  28. Fossils are usually found in: A) Igneous rocks
  B) Sedimentary rocks
  C) Metamorphic rocks
  D) Granite
  ✅ Answer: B
  
  29. Which statement supports Darwin's theory? A) Organisms change because they need to.
  B) Useful variations are selected by nature.
  C) Acquired characters are inherited.
  D) Evolution occurs suddenly.
  ✅ Answer: B
  
  30. Evolutionary relationships can be studied using: A) DNA comparison
  B) Fossils
  C) Homologous organs
  D) All of these
  ✅ Answer: D
  
  31. The process by which better-adapted organisms survive and reproduce is: A) Mutation
  B) Natural Selection
  C) Fertilization
  D) Hybridization
  ✅ Answer: B
  
  32. Which is an example of analogous organs? A) Human arm and whale flipper
  B) Bat wing and bird wing
  C) Human arm and bat wing
  D) Whale flipper and bat wing
  ✅ Answer: B
  
  33. Evolution takes place at the level of: A) Individual
  B) Population
  C) Organ
  D) Tissue
  ✅ Answer: B
  
  34. The similarity in embryos of different vertebrates suggests: A) Common ancestry
  B) Different ancestry
  C) Extinction
  D) Mutation only
  ✅ Answer: A
  
  35. Which of the following is NOT a factor in natural selection? A) Variation
  B) Competition
  C) Overproduction
  D) Photosynthesis
  ✅ Answer: D
  
  36. The modern human is known as: A) Homo erectus
  B) Homo habilis
  C) Homo sapiens
  D) Australopithecus
  ✅ Answer: C
  
  37. Evolution explains: A) Diversity of life forms
  B) Origin of species
  C) Adaptations
  D) All of these
  ✅ Answer: D
  
  38. The oldest fossils are generally found in: A) Upper rock layers
  B) Deepest rock layers
  C) Soil surface
  D) Water bodies
  ✅ Answer: B
  
  39. Which of the following is NOT evidence of common ancestry? A) Homologous organs
  B) Embryological similarities
  C) Fossils
  D) Analogous organs
  ✅ Answer: D
  
  40. Darwin observed natural selection during his voyage on: A) HMS Victory
  B) HMS Beagle
  C) Titanic
  D) Mayflower
  ✅ Answer: B
  
  PYQ Trick Question 🚨
  
  41. Evolution cannot be equated with progress because: A) Evolution always produces better organisms
  B) Evolution only increases complexity
  C) Evolution is simply change over generations, not necessarily improvement
  D) Evolution stops after adaptation
  ✅ Answer: C
- Related posts
- Class10 how do organisms reproduce. https://www.learnwithafsa.online/2026/05/how-do-organisms-reproduce-class-10-notes.html
- https://www.learnwithafsa.online/2026/05/class-10-notes-cbse.html
- https://www.learnwithafsa.online/2026/05/life-processes-class-10-notes.html

Human Reproduction Notes & MCQs for NEET 2027 | NCERT Hindi-English Notes, 200 Questions, PYQs & Assertion Reason

Human Reproduction MCQs (Q1–30)

Q1.

The male reproductive system consists of:

A) Testes, duct system, accessory glands and external genitalia
B) Testes and penis only
C) Testes and duct system only
D) Testes and accessory glands only

✅ Answer: A

Q2.

The scrotum helps in:

A) Testosterone synthesis only
B) Maintaining lower temperature for spermatogenesis
C) Urine storage
D) Sperm transport

✅ Answer: B

Q3.

Which cells are called "nurse cells" of testis?

A) Leydig cells
B) Sertoli cells
C) Spermatogonia
D) Spermatids

✅ Answer: B

Q4.

Testosterone is secreted by:

A) Sertoli cells
B) Leydig cells
C) Spermatids
D) Epididymis

✅ Answer: B

Q5.

Spermatogenesis occurs in:

A) Epididymis
B) Vas deferens
C) Seminiferous tubules
D) Urethra

✅ Answer: C

Q6.

Which structure stores and matures sperms?

A) Vas deferens
B) Epididymis
C) Seminiferous tubules
D) Urethra

✅ Answer: B

Q7.

The ejaculatory duct is formed by the union of:

A) Epididymis and urethra
B) Vas deferens and duct of seminal vesicle
C) Testis and urethra
D) Vas deferens and prostate gland

✅ Answer: B

Q8.

Fructose-rich secretion is produced by:

A) Prostate gland
B) Bulbourethral gland
C) Seminal vesicle
D) Testis

✅ Answer: C

Q9.

The acrosome of sperm is derived from:

A) Nucleus
B) Mitochondria
C) Golgi apparatus
D) Ribosome

✅ Answer: C

Q10.

Acrosome contains enzymes for:

A) ATP synthesis
B) Ovum penetration
C) Testosterone production
D) Cell division

✅ Answer: B

Q11.

Which part of sperm contains mitochondria?

A) Head
B) Neck
C) Middle piece
D) Tail

✅ Answer: C

Q12.

One primary spermatocyte produces:

A) 1 sperm
B) 2 sperms
C) 3 sperms
D) 4 sperms

✅ Answer: D

Q13.

Spermiogenesis is:

A) Formation of spermatids
B) Transformation of spermatids into spermatozoa
C) Release of sperms
D) Fertilisation

✅ Answer: B

Q14.

Release of spermatozoa from Sertoli cells is called:

A) Spermatogenesis
B) Spermiation
C) Capacitation
D) Ovulation

✅ Answer: B

Q15.

LH acts on:

A) Sertoli cells
B) Leydig cells
C) Oogonia
D) Ovum

✅ Answer: B

Q16.

FSH acts mainly on:

A) Leydig cells
B) Sertoli cells
C) Ovum
D) Corpus luteum

✅ Answer: B

Q17.

The female primary reproductive organs are:

A) Oviducts
B) Ovaries
C) Uterus
D) Vagina

✅ Answer: B

Q18.

The finger-like projections of infundibulum are:

A) Villi
B) Fimbriae
C) Cilia
D) Microvilli

✅ Answer: B

Q19.

The longest part of oviduct is:

A) Infundibulum
B) Ampulla
C) Isthmus
D) Cervix

✅ Answer: B

Q20.

Fertilisation usually occurs at:

A) Uterus
B) Cervix
C) Ampullary–Isthmic junction
D) Vagina

✅ Answer: C

Q21.

The inner lining of uterus is:

A) Perimetrium
B) Myometrium
C) Endometrium
D) Mesometrium

✅ Answer: C

Q22.

The muscular layer of uterus is:

A) Endometrium
B) Perimetrium
C) Myometrium
D) Serosa

✅ Answer: C

Q23.

Which hormone is mainly produced by ovarian follicles?

A) Testosterone
B) Estrogen
C) hCG
D) Oxytocin

✅ Answer: B

Q24.

The female external genitalia are collectively called:

A) Vulva
B) Cervix
C) Uterus
D) Ovary

✅ Answer: A

Q25.

Each mammary gland contains:

A) 5–10 lobes
B) 10–15 lobes
C) 15–20 lobes
D) 20–25 lobes

✅ Answer: C

Q26.

Milk is produced in:

A) Mammary ducts
B) Alveoli
C) Nipple
D) Lobules only

✅ Answer: B

Q27.

Which of the following is haploid?

A) Spermatogonium
B) Primary spermatocyte
C) Secondary spermatocyte
D) Leydig cell

✅ Answer: C

Q28.

Which cell enters meiosis-I during spermatogenesis?

A) Spermatogonium
B) Primary spermatocyte
C) Secondary spermatocyte
D) Spermatid

✅ Answer: B

Q29.

The chromosome number in spermatid is:

A) 46
B) 23 pairs
C) 23
D) 92

✅ Answer: C

Q30.

Which structure forms the birth canal along with the vagina?

A) Ovary
B) Cervix
C) Endometrium
D) Fimbriae

✅ Answer: B

Quick Score Key

27–30 = Excellent
22–26 = Good
15–21 = Needs Revision
Below 15 = Re-read Notes
Human Reproduction MCQs (Q31–60)

Oogenesis + Menstrual Cycle + Hormonal Control (NCERT Based | NEET Level)

Q31.

Oogenesis begins:

A) At puberty
B) Before birth
C) After menopause
D) During fertilisation

✅ Answer: B

Q32.

Oogonia multiply by:

A) Meiosis I
B) Meiosis II
C) Mitosis
D) Amitosis

✅ Answer: C

Q33.

Primary oocytes are formed during:

A) Foetal life
B) Puberty
C) Menopause
D) Fertilisation

✅ Answer: A

Q34.

At birth, a female baby possesses approximately:

A) 60,000–80,000 primary oocytes
B) 1–2 million primary oocytes
C) 10 million primary oocytes
D) 400 primary oocytes

✅ Answer: B

Q35.

At puberty, the number of primary follicles is approximately:

A) 60,000–80,000
B) 1–2 million
C) 10 million
D) 400

✅ Answer: A

Q36.

The first meiotic division in oogenesis is completed:

A) Before birth
B) At puberty
C) Just before ovulation
D) After fertilisation

✅ Answer: C

Q37.

Secondary oocyte is produced after:

A) Mitosis
B) Meiosis I
C) Meiosis II
D) Fertilisation

✅ Answer: B

Q38.

Completion of Meiosis II in human female occurs:

A) Before ovulation
B) During menstruation
C) Only after fertilisation
D) At puberty

✅ Answer: C

Q39.

One primary oocyte ultimately produces:

A) 4 ova
B) 2 ova
C) 1 ovum + 3 polar bodies
D) 4 polar bodies only

✅ Answer: C

Q40.

Polar bodies are formed because cytokinesis is:

A) Equal
B) Unequal
C) Absent
D) Random

✅ Answer: B

Menstrual Cycle

Q41.

The average duration of menstrual cycle is:

A) 14 days
B) 21 days
C) 28 days
D) 35 days

✅ Answer: C

Q42.

Menstrual phase generally lasts:

A) Day 1–5
B) Day 5–10
C) Day 10–15
D) Day 15–20

✅ Answer: A

Q43.

Menstrual flow occurs due to:

A) Fertilisation
B) Breakdown of endometrium
C) Ovulation
D) Implantation

✅ Answer: B

Q44.

Follicular phase is mainly controlled by:

A) LH
B) FSH
C) hCG
D) Oxytocin

✅ Answer: B

Q45.

Which hormone stimulates growth of ovarian follicles?

A) LH
B) FSH
C) Progesterone
D) Prolactin

✅ Answer: B

Q46.

Growing follicles secrete:

A) Testosterone
B) Estrogen
C) Oxytocin
D) hCG

✅ Answer: B

Q47.

Ovulation normally occurs on:

A) Day 5
B) Day 10
C) Day 14
D) Day 28

✅ Answer: C

Q48.

Ovulation is triggered by:

A) FSH surge
B) LH surge
C) hCG surge
D) Progesterone surge

✅ Answer: B

Q49.

The ruptured Graafian follicle transforms into:

A) Corpus albicans
B) Corpus luteum
C) Morula
D) Blastocyst

✅ Answer: B

Q50.

Corpus luteum secretes mainly:

A) Testosterone
B) FSH
C) Progesterone
D) hCG

✅ Answer: C

Q51.

The luteal phase occurs between:

A) Day 1–5
B) Day 6–13
C) Day 14 only
D) Day 15–28

✅ Answer: D

Q52.

Progesterone prepares the uterus for:

A) Menstruation
B) Implantation
C) Ovulation
D) Lactation

✅ Answer: B

Q53.

If fertilisation does not occur, corpus luteum:

A) Persists permanently
B) Enlarges continuously
C) Degenerates
D) Forms placenta

✅ Answer: C

Q54.

Degeneration of corpus luteum causes:

A) Increase in progesterone
B) Increase in estrogen
C) Decrease in progesterone and menstruation
D) Ovulation

✅ Answer: C

Q55.

Which phase is also called proliferative phase?

A) Menstrual phase
B) Follicular phase
C) Luteal phase
D) Ovulatory phase

✅ Answer: B

Q56.

Secretory phase corresponds to:

A) Menstrual phase
B) Follicular phase
C) Luteal phase
D) Ovulation

✅ Answer: C

Q57.

The endometrium becomes thickest during:

A) Menstrual phase
B) Follicular phase
C) Secretory phase
D) Ovulation

✅ Answer: C

Q58.

Menstrual cycle is absent during:

A) Pregnancy
B) Menopause
C) Childhood
D) All of these

✅ Answer: D

Q59.

The first menstruation is called:

A) Menopause
B) Menarche
C) Ovulation
D) Parturition

✅ Answer: B

Q60.

Permanent cessation of menstrual cycle is called:

A) Menarche
B) Ovulation
C) Menopause
D) Lactation

✅ Answer: C

🔥 NEET NCERT Facts from Q31–60

✅ Oogenesis starts before birth.

✅ Meiosis-II completes only after fertilisation.

✅ 1 Primary Oocyte → 1 Ovum + 3 Polar Bodies.

✅ Menstrual cycle = 28 ± 2 days.

✅ Ovulation = Day 14.

✅ LH Surge causes ovulation.

✅ Corpus luteum secretes progesterone.

✅ Progesterone prepares uterus for implantation.

✅ Menarche = First menstruation.

✅ Menopause = Permanent stoppage of menstruation.

Most Repeated NEET Questions
1. Ovulation triggered by? → LH Surge
2. Fertilisation site? → Ampullary-Isthmic Junction
3. Meiosis II completes when? → After fertilisation
4. Corpus luteum secretes? → Progesterone
5. Human Reproduction MCQs (Q61–90)
  
  Fertilisation, Cleavage, Implantation, Pregnancy, Placenta (NEET Level)
  
  Q61.
  
  Fertilisation in humans usually occurs in:
  
  A) Uterus
  B) Cervix
  C) Vagina
  D) Ampullary-Isthmic Junction
  
  ✅ Answer: D
  
  Q62.
  
  The sperm first binds to:
  
  A) Endometrium
  B) Zona pellucida
  C) Placenta
  D) Corpus luteum
  
  ✅ Answer: B
  
  Q63.
  
  Acrosomal reaction helps in:
  
  A) Implantation
  B) Ovulation
  C) Penetration of ovum
  D) Lactation
  
  ✅ Answer: C
  
  Q64.
  
  The fusion of sperm and ovum forms:
  
  A) Morula
  B) Blastocyst
  C) Zygote
  D) Embryo
  
  ✅ Answer: C
  
  Q65.
  
  After fertilisation, the chromosome number in zygote is:
  
  A) n
  B) 2n
  C) 3n
  D) 4n
  
  ✅ Answer: B
  
  Q66.
  
  The cortical reaction prevents:
  
  A) Ovulation
  B) Implantation
  C) Polyspermy
  D) Menstruation
  
  ✅ Answer: C
  
  Q67.
  
  Cleavage is:
  
  A) Growth in size of embryo
  B) Rapid mitotic divisions of zygote
  C) Meiosis of embryo
  D) Implantation
  
  ✅ Answer: B
  
  Q68.
  
  A solid ball of 8–16 blastomeres is called:
  
  A) Blastocyst
  B) Morula
  C) Gastrula
  D) Embryo
  
  ✅ Answer: B
  
  Q69.
  
  Morula is formed approximately when embryo has:
  
  A) 2–4 cells
  B) 4–8 cells
  C) 8–16 cells
  D) 64 cells
  
  ✅ Answer: C
  
  Q70.
  
  Morula reaches the uterus after:
  
  A) Ovulation
  B) Fertilisation
  C) Cleavage divisions in oviduct
  D) Implantation
  
  ✅ Answer: C
  
  Q71.
  
  The blastocyst consists of:
  
  A) Only trophoblast
  B) Only inner cell mass
  C) Trophoblast and inner cell mass
  D) Endometrium and trophoblast
  
  ✅ Answer: C
  
  Q72.
  
  The trophoblast mainly contributes to:
  
  A) Embryo formation
  B) Placenta formation
  C) Ovary formation
  D) Corpus luteum formation
  
  ✅ Answer: B
  
  Q73.
  
  The inner cell mass gives rise to:
  
  A) Placenta
  B) Foetus
  C) Endometrium
  D) Corpus luteum
  
  ✅ Answer: B
  
  Q74.
  
  Implantation generally occurs:
  
  A) 1–2 days after fertilisation
  B) 3–4 days after fertilisation
  C) 6–7 days after fertilisation
  D) 15 days after fertilisation
  
  ✅ Answer: C
  
  Q75.
  
  Implantation occurs in:
  
  A) Cervix
  B) Endometrium
  C) Ovary
  D) Oviduct
  
  ✅ Answer: B
  
  Q76.
  
  The outer layer of blastocyst involved in implantation is:
  
  A) Inner cell mass
  B) Trophoblast
  C) Morula
  D) Amnion
  
  ✅ Answer: B
  
  Q77.
  
  The embryonic stage lasts up to:
  
  A) 2 weeks
  B) 4 weeks
  C) 8 weeks
  D) 12 weeks
  
  ✅ Answer: C
  
  Q78.
  
  After 8 weeks of pregnancy, the developing baby is called:
  
  A) Embryo
  B) Zygote
  C) Foetus
  D) Blastocyst
  
  ✅ Answer: C
  
  Q79.
  
  Human gestation period is approximately:
  
  A) 180 days
  B) 220 days
  C) 280 days
  D) 365 days
  
  ✅ Answer: C
  
  Q80.
  
  The placenta develops mainly from:
  
  A) Endometrium only
  B) Trophoblast only
  C) Maternal and foetal tissues together
  D) Ovary
  
  ✅ Answer: C
  
  Q81.
  
  Placenta acts as:
  
  A) Respiratory organ
  B) Excretory organ
  C) Nutritive organ
  D) All of these
  
  ✅ Answer: D
  
  Q82.
  
  Which hormone maintains pregnancy in the early stages?
  
  A) Oxytocin
  B) hCG
  C) Prolactin
  D) FSH
  
  ✅ Answer: B
  
  Q83.
  
  hCG is secreted by:
  
  A) Corpus luteum
  B) Placenta
  C) Pituitary
  D) Ovary
  
  ✅ Answer: B
  
  Q84.
  
  hCG helps in maintaining:
  
  A) Endometrium directly
  B) Corpus luteum
  C) Ovulation
  D) Menstruation
  
  ✅ Answer: B
  
  Q85.
  
  Which hormone is called Human Chorionic Gonadotropin?
  
  A) hPL
  B) hCG
  C) FSH
  D) LH
  
  ✅ Answer: B
  
  Q86.
  
  Placenta also secretes:
  
  hCG
  
  hPL
  
  Estrogen
  
  Progesterone
  
  A) 1 and 2 only
  B) 1, 2 and 3 only
  C) 1, 2, 3 and 4
  D) 3 and 4 only
  
  ✅ Answer: C
  
  Q87.
  
  The hormone responsible for milk production is:
  
  A) Oxytocin
  B) Prolactin
  C) hCG
  D) LH
  
  ✅ Answer: B
  
  Q88.
  
  The hormone responsible for milk ejection is:
  
  A) Prolactin
  B) Estrogen
  C) Oxytocin
  D) FSH
  
  ✅ Answer: C
  
  Q89.
  
  The first milk secreted after childbirth is:
  
  A) Lactose
  B) Colostrum
  C) Placental fluid
  D) Amniotic fluid
  
  ✅ Answer: B
  
  Q90.
  
  Colostrum is rich in:
  
  A) Testosterone
  B) Lipids only
  C) IgA antibodies
  D) hCG
  
  ✅ Answer: C
  
  🎯 NCERT One-Liners for NEET
  
  Fertilisation → Ampullary-Isthmic Junction
  
  Morula → 8–16 blastomeres
  
  Implantation → 6–7 days after fertilisation
  
  Embryo → up to 8 weeks
  
  Foetus → after 8 weeks
  
  Gestation period → 280 days (40 weeks)
  
  hCG maintains corpus luteum
  
  Placenta secretes hCG, hPL, estrogen, progesterone
  
  Prolactin → milk production
  
  Oxytocin → milk ejection & parturition
  
  Colostrum → IgA-rich antibodies
  
  अगले सेट Q91–120 में Parturition, Lactation, Assertion-Reason, Statement-Based, Match the Column और PYQ-level tricky questions होंगे।
6. Human Reproduction MCQs (Q91–120)
  Assertion–Reason + NCERT Tricky + PYQ Pattern
  Assertion–Reason Options
  A. Assertion and Reason both are true and Reason is the correct explanation of Assertion.
  B. Assertion and Reason both are true but Reason is NOT the correct explanation of Assertion.
  C. Assertion is true but Reason is false.
  D. Assertion is false but Reason is true.
  Q91
  Assertion (A): Fertilisation in humans usually occurs at the ampullary-isthmic junction.
  Reason (R): This region is the site where sperm and secondary oocyte usually meet.
  ✅ Answer: A
  Q92
  Assertion (A): Acrosome is essential for fertilisation.
  Reason (R): Acrosome contains enzymes that help sperm penetrate the ovum.
  ✅ Answer: A
  Q93
  Assertion (A): One primary spermatocyte produces four spermatozoa.
  Reason (R): Meiosis produces four haploid cells.
  ✅ Answer: A
  Q94
  Assertion (A): One primary oocyte produces four functional ova.
  Reason (R): Cytokinesis is unequal during oogenesis.
  ✅ Answer: D
  (Assertion false, Reason true)
  Q95
  Assertion (A): Corpus luteum secretes progesterone.
  Reason (R): Progesterone prepares the uterus for implantation.
  ✅ Answer: A
  Q96
  Assertion (A): Menstruation occurs when fertilisation does not occur.
  Reason (R): Corpus luteum degenerates causing a fall in progesterone.
  ✅ Answer: A
  Q97
  Assertion (A): Implantation occurs in the endometrium.
  Reason (R): Endometrium is the innermost glandular layer of uterus.
  ✅ Answer: B
  Q98
  Assertion (A): Placenta acts as an endocrine tissue.
  Reason (R): Placenta secretes hCG and hPL.
  ✅ Answer: A
  Q99
  Assertion (A): Oxytocin helps in milk ejection.
  Reason (R): Oxytocin causes contraction of myoepithelial cells.
  ✅ Answer: A
  Q100
  Assertion (A): Colostrum is important for newborn babies.
  Reason (R): It contains IgA antibodies.
  ✅ Answer: A
  Statement Based Questions
  Q101
  Which statements are correct?
  1. Sertoli cells nourish sperms.
  2. Leydig cells produce testosterone.
  3. Spermatogenesis occurs in epididymis.
  A) 1 and 2 only
  B) 2 and 3 only
  C) 1 and 3 only
  D) 1, 2 and 3
  ✅ Answer: A
  Q102
  Which statements are correct?
  1. Acrosome is Golgi-derived.
  2. Middle piece contains mitochondria.
  3. Tail provides motility.
  A) 1 only
  B) 1 and 2 only
  C) 2 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q103
  Which of the following are parts of oviduct?
  1. Infundibulum
  2. Ampulla
  3. Isthmus
  A) 1 only
  B) 2 and 3 only
  C) 1 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q104
  Which statements regarding ovulation are correct?
  1. Triggered by LH surge.
  2. Usually occurs on day 14.
  3. Releases secondary oocyte.
  A) 1 and 2 only
  B) 2 and 3 only
  C) 1 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q105
  Which hormone mainly prepares uterus for implantation?
  A) Estrogen
  B) Testosterone
  C) Progesterone
  D) FSH
  ✅ Answer: C
  Match the Column
  Q106
  Match List-I with List-II:
  
  List-I List-II
  
  A. Sertoli Cells 1. Testosterone
  
  B. Leydig Cells 2. Nourishment
  
  C. Acrosome 3. Ovum penetration
  
  D. Corpus luteum 4. Progesterone
  
  A) A-2, B-1, C-3, D-4
  B) A-1, B-2, C-4, D-3
  C) A-2, B-4, C-3, D-1
  D) A-3, B-2, C-1, D-4
  ✅ Answer: A
  Q107
  Match the following:
  
  Structure Function
  
  A. Fimbriae 1. Implantation
  
  B. Endometrium 2. Collect ovum
  
  C. Myometrium 3. Labour contractions
  
  D. Ampullary-Isthmic Junction 4. Fertilisation
  
  A) A-2, B-1, C-3, D-4
  B) A-1, B-2, C-4, D-3
  C) A-3, B-1, C-2, D-4
  D) A-2, B-4, C-3, D-1
  ✅ Answer: A
  NCERT Line-Based Questions
  Q108
  The first menstruation at puberty is called:
  A) Menopause
  B) Menarche
  C) Ovulation
  D) Parturition
  ✅ Answer: B
  Q109
  Permanent cessation of menstruation is:
  A) Menarche
  B) Menopause
  C) Lactation
  D) Fertilisation
  ✅ Answer: B
  Q110
  The hormone secreted by placenta and detected in pregnancy tests is:
  A) FSH
  B) LH
  C) hCG
  D) Oxytocin
  ✅ Answer: C
  Q111
  The hormone responsible for uterine contractions during childbirth is:
  A) Estrogen
  B) Oxytocin
  C) FSH
  D) hPL
  ✅ Answer: B
  Q112
  Parturition is initiated by:
  A) Foetal ejection reflex
  B) Menstrual reflex
  C) Ovulation reflex
  D) Implantation reflex
  ✅ Answer: A
  Q113
  Human gestation period is approximately:
  A) 180 days
  B) 220 days
  C) 280 days
  D) 365 days
  ✅ Answer: C
  Q114
  The embryo develops into a foetus after:
  A) 2 weeks
  B) 4 weeks
  C) 8 weeks
  D) 12 weeks
  ✅ Answer: C
  Q115
  The placenta provides:
  1. Nutrition
  2. Respiration
  3. Excretion
  A) 1 only
  B) 1 and 2 only
  C) 2 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q116
  Which hormone stimulates milk production?
  A) Prolactin
  B) Oxytocin
  C) LH
  D) hCG
  ✅ Answer: A
  Q117
  Which hormone stimulates milk ejection?
  A) Prolactin
  B) Estrogen
  C) Oxytocin
  D) Progesterone
  ✅ Answer: C
  Q118
  The first milk produced after childbirth is:
  A) Plasma
  B) Colostrum
  C) Lactose
  D) Endometrium
  ✅ Answer: B
  Q119
  Colostrum is rich in:
  A) Testosterone
  B) IgA antibodies
  C) Progesterone
  D) FSH
  ✅ Answer: B
  Q120
  Which statement is correct?
  A) Fertilisation occurs in uterus. B) Implantation occurs in oviduct. C) Fertilisation occurs at ampullary-isthmic junction and implantation in endometrium. D) Fertilisation and implantation both occur in ovary.
  ✅ Answer: C
  🔥 Most Repeated NEET Facts
  - Sertoli → Nourishment
  - Leydig → Testosterone
  - LH Surge → Ovulation
  - Fertilisation → Ampullary-Isthmic Junction
  - Implantation → Endometrium
  - hCG → Maintains corpus luteum
  - Prolactin → Milk production
  - Oxytocin → Milk ejection + Parturition
  - Colostrum → IgA antibodies
  - Menarche = First menstruation, Menopause = Permanent cessation
  अगला सेट Q121–150 में और कठिन NEET PYQ-style, Multiple Statement, Match the Column और NCERT Exemplar level प्रश्न होंगे।
7. Human Reproduction MCQs (Q121–150)
  NEET PYQ Style | NCERT Exemplar Level | High-Yield
  Q121
  Which of the following structures is NOT derived from the blastocyst?
  A) Trophoblast
  B) Inner cell mass
  C) Placenta
  D) Corpus luteum
  ✅ Answer: D
  Q122
  The immediate product of fertilisation is:
  A) Morula
  B) Blastocyst
  C) Zygote
  D) Embryo
  ✅ Answer: C
  Q123
  How many chromosomes are present in a human secondary oocyte?
  A) 46
  B) 23 pairs
  C) 23
  D) 92
  ✅ Answer: C
  Q124
  Which of the following is haploid?
  1. Spermatid
  2. Secondary spermatocyte
  3. Ovum
  A) 1 only
  B) 1 and 2 only
  C) 2 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q125
  The acrosomal cap contains:
  A) Testosterone
  B) Digestive enzymes
  C) DNA
  D) RNA
  ✅ Answer: B
  Q126
  The first cleavage division of zygote is:
  A) Meiotic
  B) Mitotic
  C) Amitotic
  D) Reductional
  ✅ Answer: B
  Q127
  Which stage enters the uterus?
  A) Secondary oocyte only
  B) Morula and later blastocyst
  C) Spermatid
  D) Corpus luteum
  ✅ Answer: B
  Q128
  The blastocoel is present in:
  A) Morula
  B) Blastocyst
  C) Zygote
  D) Gastrula
  ✅ Answer: B
  Q129
  The cavity of blastocyst is called:
  A) Coelom
  B) Blastocoel
  C) Amnion
  D) Chorion
  ✅ Answer: B
  Q130
  Which part of blastocyst forms the embryo proper?
  A) Trophoblast
  B) Zona pellucida
  C) Inner cell mass
  D) Blastocoel
  ✅ Answer: C
  Q131
  The placenta is connected to the foetus by:
  A) Oviduct
  B) Cervix
  C) Umbilical cord
  D) Endometrium
  ✅ Answer: C
  Q132
  Umbilical cord helps in:
  A) Fertilisation
  B) Implantation
  C) Transport between foetus and placenta
  D) Menstruation
  ✅ Answer: C
  Q133
  Which hormone is known as the "pregnancy hormone"?
  A) FSH
  B) LH
  C) hCG
  D) Oxytocin
  ✅ Answer: C
  Q134
  Human chorionic gonadotropin is secreted by:
  A) Pituitary
  B) Corpus luteum
  C) Placenta
  D) Ovary
  ✅ Answer: C
  Q135
  The placenta acts as:
  1. Respiratory organ
  2. Nutritive organ
  3. Endocrine organ
  A) 1 only
  B) 2 only
  C) 1 and 2 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q136
  The placenta secretes:
  1. hCG
  2. hPL
  3. Estrogen
  4. Progesterone
  A) 1 and 2 only
  B) 1, 2 and 3 only
  C) 2, 3 and 4 only
  D) 1, 2, 3 and 4
  ✅ Answer: D
  Q137
  Which hormone stimulates mammary gland development during pregnancy?
  A) hPL
  B) Testosterone
  C) FSH
  D) LH
  ✅ Answer: A
  Q138
  The gestation period in humans is approximately:
  A) 32 weeks
  B) 36 weeks
  C) 40 weeks
  D) 52 weeks
  ✅ Answer: C
  Q139
  Foetal ejection reflex is associated with:
  A) Fertilisation
  B) Implantation
  C) Parturition
  D) Menstruation
  ✅ Answer: C
  Q140
  The hormone mainly responsible for parturition is:
  A) FSH
  B) LH
  C) Oxytocin
  D) hCG
  ✅ Answer: C
  Assertion–Reason
  Q141
  Assertion: Sertoli cells are called nurse cells.
  Reason: They provide nourishment to developing sperms.
  A) Both true and Reason explains Assertion
  B) Both true but Reason does not explain
  C) Assertion true, Reason false
  D) Assertion false, Reason true
  ✅ Answer: A
  Q142
  Assertion: Fertilisation restores diploid chromosome number.
  Reason: Fusion of two haploid gametes forms a diploid zygote.
  ✅ Answer: A
  Q143
  Assertion: Meiosis II in secondary oocyte completes before fertilisation.
  Reason: Secondary oocyte is arrested at metaphase-II.
  ✅ Answer: D
  (Assertion false, Reason true)
  Q144
  Assertion: Corpus luteum degenerates if fertilisation does not occur.
  Reason: hCG is not available to maintain it.
  ✅ Answer: A
  Q145
  Assertion: Implantation occurs in the endometrium.
  Reason: Endometrium is highly vascular and glandular.
  ✅ Answer: A
  Match the Column
  Q146
  
  List I List II
  
  A. Leydig cells 1. Testosterone
  
  B. Sertoli cells 2. Nourishment
  
  C. Acrosome 3. Ovum penetration
  
  D. Corpus luteum 4. Progesterone
  
  A) A-1, B-2, C-3, D-4
  B) A-2, B-1, C-4, D-3
  C) A-3, B-2, C-1, D-4
  D) A-1, B-3, C-2, D-4
  ✅ Answer: A
  Q147
  
  Structure Function
  
  A. Fimbriae 1. Collect ovum
  
  B. Ampullary-Isthmic Junction 2. Fertilisation
  
  C. Endometrium 3. Implantation
  
  D. Myometrium 4. Labour contractions
  
  A) A-1, B-2, C-3, D-4
  B) A-2, B-1, C-4, D-3
  C) A-1, B-3, C-2, D-4
  D) A-4, B-2, C-3, D-1
  ✅ Answer: A
  Q148
  Which of the following correctly represents the sequence?
  A) Morula → Zygote → Blastocyst
  B) Zygote → Morula → Blastocyst
  C) Blastocyst → Morula → Zygote
  D) Zygote → Blastocyst → Morula
  ✅ Answer: B
  Q149
  Which event occurs first?
  A) Implantation
  B) Blastocyst formation
  C) Fertilisation
  D) Morula formation
  ✅ Answer: C
  Q150
  Which statement is correct?
  A) Fertilisation occurs in uterus. B) Implantation occurs in endometrium. C) Ovulation is caused by progesterone surge. D) Meiosis II in oocyte completes before ovulation.
  ✅ Answer: B
  🎯 NCERT Revision Box
  ✅ Fertilisation → Ampullary-Isthmic Junction
  ✅ Implantation → Endometrium
  ✅ Morula → 8–16 blastomeres
  ✅ Blastocyst → Trophoblast + Inner Cell Mass
  ✅ hCG → Maintains corpus luteum
  ✅ hPL → Mammary gland development
  ✅ Oxytocin → Parturition + Milk ejection
  ✅ Prolactin → Milk production
  ✅ Meiosis II completes only after fertilisation
  ✅ Gestation period → 280 days (40 weeks)
  
  अगला सेट Q151–200 में केवल NEET PYQs, NCERT Exemplar-type tricky questions, Multiple Correct, Statement-Based और Previous Year Patterns होंगे।
8. Human Reproduction MCQs (Q151–175)
  NEET PYQ Pattern | NCERT Line-by-Line | Tricky Questions
  Q151
  The structure that receives the ovum after ovulation is:
  A) Ampulla
  B) Isthmus
  C) Fimbriae of infundibulum
  D) Uterus
  ✅ Answer: C
  Q152
  Which of the following is NOT a part of the male duct system?
  A) Rete testis
  B) Vasa efferentia
  C) Epididymis
  D) Seminiferous tubule
  ✅ Answer: D
  Q153
  Seminal plasma is contributed mainly by:
  A) Testes only
  B) Epididymis only
  C) Accessory glands
  D) Urethra
  ✅ Answer: C
  Q154
  The chromosome number in a primary spermatocyte is:
  A) 23
  B) n
  C) 46
  D) 22
  ✅ Answer: C
  Q155
  Secondary spermatocyte contains:
  A) 46 chromosomes
  B) 23 chromosomes
  C) 92 chromosomes
  D) 44 chromosomes
  ✅ Answer: B
  Q156
  The hormone directly responsible for spermatogenesis is:
  A) Estrogen
  B) Testosterone
  C) Oxytocin
  D) hCG
  ✅ Answer: B
  Q157
  Which cell division reduces chromosome number by half?
  A) Mitosis
  B) Meiosis I
  C) Cytokinesis
  D) Cleavage
  ✅ Answer: B
  Q158
  The release of ovum from Graafian follicle is:
  A) Menstruation
  B) Ovulation
  C) Implantation
  D) Fertilisation
  ✅ Answer: B
  Q159
  Which ovarian structure secretes progesterone?
  A) Primary follicle
  B) Secondary follicle
  C) Corpus luteum
  D) Oogonium
  ✅ Answer: C
  Q160
  The endometrium regenerates during:
  A) Menstrual phase
  B) Follicular phase
  C) Ovulation
  D) Fertilisation
  ✅ Answer: B
  Q161
  Which hormone level peaks just before ovulation?
  A) Progesterone
  B) Oxytocin
  C) LH
  D) hCG
  ✅ Answer: C
  Q162
  The female gamete released during ovulation is actually:
  A) Ovum
  B) Oogonium
  C) Primary oocyte
  D) Secondary oocyte
  ✅ Answer: D
  Q163
  The sperm acquires fertilising capacity in the female reproductive tract by:
  A) Cleavage
  B) Capacitation
  C) Ovulation
  D) Spermiogenesis
  ✅ Answer: B
  Q164
  Zona pellucida surrounds:
  A) Sperm
  B) Ovum/Secondary oocyte
  C) Placenta
  D) Blastocyst
  ✅ Answer: B
  Q165
  The block to polyspermy is mainly due to:
  A) LH surge
  B) Cortical reaction
  C) Implantation
  D) Menstruation
  ✅ Answer: B
  Q166
  The embryo with 8–16 blastomeres is called:
  A) Blastocyst
  B) Morula
  C) Gastrula
  D) Foetus
  ✅ Answer: B
  Q167
  The trophoblast forms:
  A) Embryo proper
  B) Placenta
  C) Ovary
  D) Endometrium
  ✅ Answer: B
  Q168
  Inner cell mass ultimately develops into:
  A) Placenta
  B) Chorion
  C) Embryo
  D) Corpus luteum
  ✅ Answer: C
  Q169
  Human pregnancy is detected by testing:
  A) FSH
  B) LH
  C) hCG
  D) Prolactin
  ✅ Answer: C
  Q170
  The hormone responsible for maintaining corpus luteum during early pregnancy is:
  A) FSH
  B) hCG
  C) Oxytocin
  D) Prolactin
  ✅ Answer: B
  Assertion–Reason
  Q171
  Assertion: Colostrum provides passive immunity to newborns.
  Reason: Colostrum contains IgA antibodies.
  A) Both true and Reason explains Assertion
  B) Both true but Reason not explanation
  C) Assertion true, Reason false
  D) Assertion false, Reason true
  ✅ Answer: A
  Q172
  Assertion: Oxytocin is called the birth hormone.
  Reason: It induces strong uterine contractions during parturition.
  ✅ Answer: A
  Q173
  Assertion: Blastocyst is formed before morula.
  Reason: Morula develops into blastocyst.
  ✅ Answer: D
  (Assertion false, Reason true)
  Q174
  Assertion: Placenta acts as an endocrine gland.
  Reason: It secretes hCG, hPL, estrogen and progesterone.
  ✅ Answer: A
  Q175
  Assertion: Implantation occurs in myometrium.
  Reason: Myometrium is muscular layer of uterus.
  ✅ Answer: D
  (Assertion false, Reason true)
  🔥 Super-Important NCERT Facts
  ✅ Ovulated cell = Secondary Oocyte
  ✅ Fertilisation site = Ampullary-Isthmic Junction
  ✅ Implantation site = Endometrium
  ✅ Morula = 8–16 blastomeres
  ✅ Trophoblast → Placenta
  ✅ Inner Cell Mass → Embryo
  ✅ hCG → Maintains Corpus Luteum
  ✅ Oxytocin → Parturition & Milk Ejection
  ✅ Prolactin → Milk Production
  ✅ Colostrum → IgA Antibodies
  
  Next: Q176–200 (Final Part) — toughest NEET PYQ-style questions, statement-based, match-the-column, and NCERT traps.
9. Human Reproduction MCQs (Q176–200)
  Final NEET Revision Set | NCERT Traps + PYQ Style
  Q176
  Which of the following correctly represents the path of sperm movement?
  A) Seminiferous tubules → Epididymis → Rete testis → Vas deferens
  B) Seminiferous tubules → Rete testis → Vasa efferentia → Epididymis → Vas deferens
  C) Rete testis → Seminiferous tubules → Epididymis → Vas deferens
  D) Seminiferous tubules → Vas deferens → Epididymis
  ✅ Answer: B
  Q177
  The secretion of Sertoli cells that inhibits FSH release is:
  A) Relaxin
  B) Inhibin
  C) Oxytocin
  D) hCG
  ✅ Answer: B
  Q178
  Which hormone is responsible for development of secondary sexual characters in males?
  A) FSH
  B) LH
  C) Testosterone
  D) Estrogen
  ✅ Answer: C
  Q179
  The mature Graafian follicle contains:
  A) Primary oocyte
  B) Secondary oocyte
  C) Oogonium
  D) Ovum
  ✅ Answer: B
  Q180
  The corpus albicans is formed from:
  A) Graafian follicle before ovulation
  B) Corpus luteum after degeneration
  C) Blastocyst
  D) Endometrium
  ✅ Answer: B
  Statement-Based Questions
  Q181
  Which statements are correct?
  1. FSH stimulates follicular growth.
  2. LH induces ovulation.
  3. Corpus luteum secretes progesterone.
  A) 1 only
  B) 1 and 2 only
  C) 2 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q182
  Which statements are correct?
  1. Fertilisation occurs in ampullary-isthmic junction.
  2. Implantation occurs in endometrium.
  3. Placenta develops from maternal and foetal tissues.
  A) 1 and 2 only
  B) 2 and 3 only
  C) 1 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q183
  Which statements are correct?
  1. Colostrum contains IgA.
  2. Prolactin stimulates milk production.
  3. Oxytocin stimulates milk ejection.
  A) 1 only
  B) 1 and 2 only
  C) 2 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q184
  Which of the following are accessory glands of male reproductive system?
  1. Seminal vesicles
  2. Prostate gland
  3. Bulbourethral glands
  A) 1 only
  B) 1 and 2 only
  C) 2 and 3 only
  D) 1, 2 and 3
  ✅ Answer: D
  Q185
  Which structure is NOT part of the female reproductive tract?
  A) Oviduct
  B) Uterus
  C) Epididymis
  D) Vagina
  ✅ Answer: C
  Match the Column
  Q186
  
  List-I List-II
  
  A. Acrosome 1. ATP Production
  
  B. Middle Piece 2. Enzymes
  
  C. Tail 3. Motility
  
  D. Head 4. Nucleus
  
  A) A-2, B-1, C-3, D-4
  B) A-1, B-2, C-4, D-3
  C) A-3, B-1, C-2, D-4
  D) A-2, B-4, C-3, D-1
  ✅ Answer: A
  Q187
  
  List-I List-II
  
  A. Menarche 1. First Menstruation
  
  B. Menopause 2. Permanent cessation
  
  C. Parturition 3. Childbirth
  
  D. Lactation 4. Milk secretion
  
  A) A-1, B-2, C-3, D-4
  B) A-2, B-1, C-4, D-3
  C) A-1, B-3, C-2, D-4
  D) A-4, B-2, C-3, D-1
  ✅ Answer: A
  NCERT Exemplar Style
  Q188
  Which hormone reaches its peak during the middle of menstrual cycle?
  A) Progesterone
  B) LH
  C) Oxytocin
  D) Prolactin
  ✅ Answer: B
  Q189
  The function of fimbriae is:
  A) Fertilisation
  B) Implantation
  C) Collection of ovum after ovulation
  D) Milk secretion
  ✅ Answer: C
  Q190
  The hormone essential for maintenance of endometrium after ovulation is:
  A) Estrogen
  B) Progesterone
  C) FSH
  D) LH
  ✅ Answer: B
  Assertion–Reason
  Q191
  Assertion: Placenta serves as an endocrine tissue.
  Reason: It secretes hCG, hPL, estrogen and progesterone.
  ✅ Answer: A
  Q192
  Assertion: Secondary oocyte completes meiosis-II before fertilisation.
  Reason: Secondary oocyte is arrested at metaphase-II.
  ✅ Answer: D
  (Assertion false, Reason true)
  Q193
  Assertion: Endometrium undergoes cyclic changes during menstrual cycle.
  Reason: Ovarian hormones regulate uterine changes.
  ✅ Answer: A
  Q194
  Assertion: LH directly stimulates Leydig cells.
  Reason: Leydig cells produce testosterone.
  ✅ Answer: A
  Q195
  Assertion: Corpus luteum is essential in early pregnancy.
  Reason: It secretes progesterone.
  ✅ Answer: A
  Final Revision Questions
  Q196
  The number of functional gametes produced from one primary oocyte is:
  A) 4
  B) 3
  C) 2
  D) 1
  ✅ Answer: D
  Q197
  The number of sperms produced from one primary spermatocyte is:
  A) 1
  B) 2
  C) 4
  D) 8
  ✅ Answer: C
  Q198
  The first structure formed after cleavage is:
  A) Blastocyst
  B) Morula
  C) Placenta
  D) Foetus
  ✅ Answer: B
  Q199
  Which one is the correct sequence?
  A) Zygote → Blastocyst → Morula → Implantation
  B) Zygote → Morula → Blastocyst → Implantation
  C) Morula → Zygote → Blastocyst → Implantation
  D) Blastocyst → Morula → Implantation
  ✅ Answer: B
  Q200
  The most accurate NCERT statement is:
  A) Fertilisation occurs in uterus and implantation in ovary. B) Fertilisation occurs in ampullary-isthmic junction and implantation in endometrium. C) Fertilisation occurs in cervix and implantation in oviduct. D) Both occur in uterus.
  ✅ Answer: B
  🚀 Human Reproduction Chapter – Top 20 NCERT Facts for NEET
  1. Testes temperature = 2–2.5°C below body temperature.
  2. Sertoli cells nourish sperms.
  3. Leydig cells secrete testosterone.
  4. Acrosome is Golgi-derived.
  5. Middle piece contains mitochondria.
  6. Spermiogenesis = Spermatid → Sperm.
  7. Spermiation = Release of sperm from Sertoli cells.
  8. Ovulation releases a secondary oocyte.
  9. Fertilisation = Ampullary-Isthmic Junction.
  10. Implantation = Endometrium.
  11. Morula = 8–16 blastomeres.
  12. Blastocyst = Trophoblast + Inner Cell Mass.
  13. Inner Cell Mass → Embryo.
  14. Trophoblast → Placenta.
  15. Placenta secretes hCG, hPL, estrogen, progesterone.
  16. hCG maintains corpus luteum.
  17. Gestation period ≈ 280 days.
  18. Oxytocin → Parturition + Milk Ejection.
  19. Prolactin → Milk Production.
  20. Colostrum contains IgA antibodies.
  🎯 All the best future doctors.

List-I	List-II
A. Sertoli Cells	1. Testosterone
B. Leydig Cells	2. Nourishment
C. Acrosome	3. Ovum penetration
D. Corpus luteum	4. Progesterone

Structure	Function
A. Fimbriae	1. Implantation
B. Endometrium	2. Collect ovum
C. Myometrium	3. Labour contractions
D. Ampullary-Isthmic Junction	4. Fertilisation

List I	List II
A. Leydig cells	1. Testosterone
B. Sertoli cells	2. Nourishment
C. Acrosome	3. Ovum penetration
D. Corpus luteum	4. Progesterone

Structure	Function
A. Fimbriae	1. Collect ovum
B. Ampullary-Isthmic Junction	2. Fertilisation
C. Endometrium	3. Implantation
D. Myometrium	4. Labour contractions

List-I	List-II
A. Acrosome	1. ATP Production
B. Middle Piece	2. Enzymes
C. Tail	3. Motility
D. Head	4. Nucleus

List-I	List-II
A. Menarche	1. First Menstruation
B. Menopause	2. Permanent cessation
C. Parturition	3. Childbirth
D. Lactation	4. Milk secretion

Life Processes MCQs with Answers (200 Questions) | Class 10 Science NCERT & PYQ Based

📘 Part 1 (Q1–Q100)

📗 Part 2 (Q101–Q200)

full chapter detail notes for board exam

Life Processes MCQ Test (Part 1: Q1–Q20)

Q1. Which enzyme is present in saliva?

Q2. The inner lining of the stomach secretes:

Q3. Which acid is present in gastric juice?

Q4. Bile juice is produced by:

Q5. The largest gland in the human body is:

Q6. Digestion of proteins begins in:

Q7. The functional unit of kidney is:

Q8. Exchange of gases takes place in:

Q9. Which blood vessel carries oxygenated blood from lungs to heart?

Q10. Human heart has:

Q11. Blood pressure is measured using:

Q12. Which pigment carries oxygen in blood?

Q13. Double circulation is found in:

Q14. Water is transported in plants through:

Q15. Food is transported in plants by:

Q16. The energy currency of the cell is:

Q17. Aerobic respiration occurs in:

Q18. The end products of aerobic respiration are:

Q19. Which chamber of the heart pumps oxygenated blood to the body?

Q20. The filtration of blood occurs in:

🔥 Important PYQ Traps

📘 Life Processes MCQs (Part 1 Continued: Q21–Q50)

Q21. Which part of the alimentary canal is the longest?

Q22. Villi are present in:

Q23. Which enzyme digests proteins in the stomach?

Q24. Which nutrient is mainly digested by lipase?

Q25. Anaerobic respiration in muscles produces:

Q26. The process of breaking down food to release energy is:

Q27. The blood vessel carrying blood from heart to lungs is:

Q28. Which component of blood helps in clotting?

Q29. White blood cells help in:

Q30. The liquid part of blood is:

Q31. Which chamber receives oxygenated blood from lungs?

Q32. The valve between left atrium and left ventricle prevents:

Q33. Blood pressure of a healthy adult is approximately:

Q34. Which tissue transports food in plants?

Q35. Translocation in plants occurs through:

Q36. Loss of water in the form of vapour from aerial parts is:

Q37. Opening and closing of stomata is controlled by:

Q38. The main nitrogenous waste in humans is:

Q39. Urine formation occurs in:

Q40. The tube carrying urine from kidney to bladder is:

Q41. The organ that stores urine is:

Q42. Which process removes metabolic wastes from the body?

Q43. Lymph mainly functions in:

Q44. Which blood vessel has the thickest wall?

Q45. Exchange of substances between blood and cells occurs through:

Q46. Which of the following is NOT a function of blood?

Q47. During vigorous exercise, muscles perform:

Q48. The movement of food from leaves to other parts of the plant is called:

Q49. Which structure prevents food from entering the windpipe?

Q50. Which statement is correct?

🎯 High-Yield NCERT Facts (Frequently Asked)

📘 Life Processes MCQs (Part 1 Continued: Q51–Q100)

Q51. Which chamber of the heart has the thickest muscular wall?

Q52. Which blood vessel carries oxygenated blood to all body parts?

Q53. The respiratory pigment present in RBCs is:

Q54. Which process occurs in alveoli?

Q55. The opening of stomata is mainly due to:

Q56. Which of the following is an excretory product in plants?

Q57. The process of taking in oxygen and giving out carbon dioxide is:

Q58. The actual breakdown of food to release energy occurs during:

Q59. Which organ secretes bile?

Q60. Gall bladder mainly functions to:

Q61. Pancreatic juice contains enzymes for digestion of:

Q62. Which structure prevents backflow of blood in veins?

Q63. The separation between right and left sides of the heart is due to:

Q64. Which of the following does NOT contain blood?

Q65. Which gas is transported mainly by haemoglobin?

Q66. Root pressure helps in:

Q67. Which part of nephron performs filtration?

Q68. Reabsorption of useful substances occurs mainly in:

Q69. Assertion (A): Arteries have thick elastic walls.

Reason (R): Blood flows through them under high pressure.

Q70. Assertion (A): Veins have valves.