Class 10 Biology – Assertion & Reason Quiz (Set 3, CBSE)

By / December 19, 2025

Class 10 Biology – Assertion & Reason Quiz (Set 3, CBSE)

Class 10 Biology – Assertion & Reason Quiz (Set 3, CBSE)

Q1. Assertion: The small intestine is the main site of nutrient absorption.
Reason: Villi and microvilli increase surface area for absorption.
Correct Answer: (a)
Villi and microvilli greatly increase the surface area, facilitating nutrient absorption.
Q2. Assertion: Alveoli have thin walls.
Reason: Thin walls help in faster gas exchange.
Correct Answer: (a)
Alveoli have thin walls and are surrounded by capillaries for efficient oxygen and carbon dioxide exchange.
Q3. Assertion: DNA replication is semi-conservative.
Reason: Each new DNA molecule contains one old strand and one new strand.
Correct Answer: (a)
Semi-conservative replication ensures one original strand is conserved in each new DNA molecule.
Q4. Assertion: The endocrine system regulates body activities.
Reason: Hormones act as chemical messengers in the blood.
Correct Answer: (a)
Hormones secreted by glands regulate growth, metabolism, and other body activities.
Q5. Assertion: Insulin is produced by pancreas.
Reason: It regulates blood sugar levels.
Correct Answer: (a)
Insulin is secreted by beta cells in pancreas and helps maintain glucose homeostasis.
Q6. Assertion: Phloem transports food in plants.
Reason: Phloem vessels have sieve tubes to carry organic nutrients.
Correct Answer: (a)
Phloem conducts food from leaves to other parts via sieve tubes.
Q7. Assertion: Human liver produces bile.
Reason: Bile emulsifies fats for digestion.
Correct Answer: (a)
Bile produced by liver helps in emulsification of fats for digestion in small intestine.
Q8. Assertion: Human kidney has nephrons.
Reason: Nephrons filter blood and form urine.
Correct Answer: (a)
Nephrons remove waste, regulate water and electrolytes in blood, producing urine.
Q9. Assertion: Lungs contain alveoli.
Reason: Alveoli increase surface area for gas exchange.
Correct Answer: (a)
Alveoli provide a large surface area for oxygen and carbon dioxide exchange in lungs.
Q10. Assertion: Fertilization in humans occurs in fallopian tubes.
Reason: Egg meets sperm immediately after ovulation.
Correct Answer: (a)
Fertilization occurs in fallopian tubes where sperm meets ovum.
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