Class 10 Biology – Assertion & Reason Quiz (Set 4, CBSE)

By / December 19, 2025

Class 10 Biology – Assertion & Reason Quiz (Set 4, CBSE)

Class 10 Biology – Assertion & Reason Quiz (Set 4, CBSE)

Q1. Assertion: Human liver detoxifies harmful substances.
Reason: Liver cells contain enzymes to break down toxins.
Correct Answer: (a)
Liver enzymes break down drugs, alcohol, and other harmful substances.
Q2. Assertion: Human blood contains white blood cells.
Reason: WBCs help in immunity.
Correct Answer: (a)
WBCs (leukocytes) defend the body against infections.
Q3. Assertion: Stomata are present in leaves.
Reason: They allow gas exchange and transpiration.
Correct Answer: (a)
Stomata permit exchange of O2, CO2, and water vapor in plants.
Q4. Assertion: Neurons transmit impulses in the body.
Reason: Neurons have axons and dendrites for conduction.
Correct Answer: (a)
Neurons carry electrical signals from one part of the body to another.
Q5. Assertion: Phloem transports organic nutrients.
Reason: Sieve tubes allow movement of food substances.
Correct Answer: (a)
Phloem distributes synthesized food from leaves to all plant parts.
Q6. Assertion: Human bones are connected by joints.
Reason: Joints provide mobility to the skeleton.
Correct Answer: (a)
Joints allow bending, rotation, and other movements of bones.
Q7. Assertion: Kidney maintains water balance.
Reason: Nephrons selectively reabsorb water and salts.
Correct Answer: (a)
Kidneys regulate water content and electrolyte balance via nephrons.
Q8. Assertion: Photosynthesis produces oxygen.
Reason: Light splits water molecules releasing oxygen.
Correct Answer: (a)
Oxygen is released during photolysis of water in photosynthesis.
Q9. Assertion: Human small intestine has villi.
Reason: Villi help in absorption of nutrients.
Correct Answer: (a)
Villi increase surface area, enhancing absorption of digested food.
Q10. Assertion: Human blood contains platelets.
Reason: Platelets help in clotting of blood.
Correct Answer: (a)
Platelets aid in blood clotting and prevent excessive bleeding.
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