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Question (1)

QN0029853

A student observed that after running for 5 minutes, both heartbeat and breathing rate increased. What is the main reason for this change?

(A) The body needs more water
(B) Muscles require more oxygen and energy
(C) Digestion becomes faster
(D) Body temperature decreases

Correct Answer: B

Explanation:

Physical activity increases energy demand, so respiration rate rises.

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Question (2)

QN0029854

Which of the following correctly explains why food must be digested before respiration can release energy?

(A) Respiration occurs only in the stomach
(B) Complex food must first be converted into simpler substances
(C) Oxygen cannot enter the lungs directly
(D) Blood carries only undigested food

Correct Answer: B

Explanation:

Digestion converts food into absorbable nutrients like glucose.

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Question (3)

QN0029855

A person eats food rich in starch and immediately begins strenuous exercise. Which two body systems will work more actively together?

(A) Digestive and respiratory systems
(B) Excretory and skeletal systems
(C) Nervous and reproductive systems
(D) Muscular and reproductive systems

Correct Answer: A

Explanation:

Digestion provides glucose while respiration releases energy.

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Question (4)

QN0029856

Which statement best explains why villi are important in the small intestine?

(A) They help in chewing food
(B) They increase the surface area for absorption
(C) They produce digestive juices only
(D) They store undigested food

Correct Answer: B

Explanation:

More surface area allows faster nutrient absorption.

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Question (5)

QN0029857

During an experiment, lime water in one test tube turned milky faster than another. This indicates that the air passed through it contained

(A) less nitrogen
(B) more oxygen
(C) more carbon dioxide
(D) less water vapour

Correct Answer: C

Explanation:

Carbon dioxide reacts with lime water to form a milky substance.

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Question (6)

QN0029858

Which structure prevents food from entering the windpipe during swallowing?

(A) Diaphragm
(B) Epiglottis
(C) Alveoli
(D) Villi

Correct Answer: B

Explanation:

The epiglottis closes the windpipe while swallowing.

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Question (7)

QN0029859

A student noticed that chewed rice gave a weaker blue-black colour with iodine than unchewed rice. What conclusion can be drawn?

(A) Saliva increased starch content
(B) Starch changed partly into sugar
(C) Rice absorbed iodine completely
(D) Saliva removed proteins from rice

Correct Answer: B

Explanation:

Saliva starts digestion of starch into sugar.

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Question (8)

QN0029860

Which of the following pairs correctly matches the organ with its primary function?

(A) Liver — absorption of nutrients
(B) Alveoli — exchange of gases
(C) Large intestine — digestion of proteins
(D) Gizzard — absorption of water

Correct Answer: B

Explanation:

Gas exchange occurs in alveoli.

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Question (9)

QN0029861

A fish cannot survive long outside water mainly because

(A) its stomach dries quickly
(B) oxygen is absent in air
(C) gills collapse and cannot exchange gases effectively
(D) blood stops flowing immediately

Correct Answer: C

Explanation:

Gills function properly only in water.

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Question (10)

QN0029862

Why do ruminants chew cud after grazing?

(A) To cool the body
(B) To absorb oxygen
(C) To digest cellulose-rich plant food properly
(D) To remove harmful bacteria

Correct Answer: C

Explanation:

Re-chewing helps break down tough plant material.

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Question (1)

A student observed that after running for 5 minutes, both heartbeat and breathing rate increased. What is the main reason for this change?

Explanation:

Link:

Question (2)

Which of the following correctly explains why food must be digested before respiration can release energy?

Explanation:

Link:

Question (3)

A person eats food rich in starch and immediately begins strenuous exercise. Which two body systems will work more actively together?

Explanation:

Link:

Question (4)

Which statement best explains why villi are important in the small intestine?

Explanation:

Link:

Question (5)

During an experiment, lime water in one test tube turned milky faster than another. This indicates that the air passed through it contained

Explanation:

Link:

Question (6)

Which structure prevents food from entering the windpipe during swallowing?

Explanation:

Link:

Question (7)

A student noticed that chewed rice gave a weaker blue-black colour with iodine than unchewed rice. What conclusion can be drawn?

Explanation:

Link:

Question (8)

Which of the following pairs correctly matches the organ with its primary function?

Explanation:

Link:

Question (9)

A fish cannot survive long outside water mainly because

Explanation:

Link:

Question (10)

Why do ruminants chew cud after grazing?

Explanation:

Link:

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