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Question (1)

QN001511

Which process is called breathing?

(A) Breaking down food into energy
(B) Inhaling and exhaling air
(C) Transport of blood
(D) Digestion of food

Correct Answer: B

Explanation:

Breathing is the process of inhaling and exhaling air.

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Question (2)

QN001512

Respiration is the process in which

(A) oxygen is only inhaled
(B) food is chewed in the mouth
(C) glucose is broken down to release energy
(D) water is absorbed in the intestine

Correct Answer: C

Explanation:

Respiration releases energy by breaking down glucose.

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Question (3)

QN001513

Which gas is required for respiration in humans?

(A) Nitrogen
(B) Carbon dioxide
(C) Oxygen
(D) Hydrogen

Correct Answer: C

Explanation:

Oxygen is essential for respiration.

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Question (4)

QN001514

Which gas is released during respiration?

(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Helium

Correct Answer: B

Explanation:

Carbon dioxide is released during respiration.

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Question (5)

QN001515

The system responsible for breathing in humans is called the

(A) digestive system
(B) circulatory system
(C) respiratory system
(D) nervous system

Correct Answer: C

Explanation:

The respiratory system helps in breathing.

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Question (6)

QN001516

Air enters the body mainly through the

(A) lungs
(B) nostrils
(C) stomach
(D) diaphragm

Correct Answer: B

Explanation:

Air enters through the nostrils.

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Question (7)

QN001517

Tiny hair inside the nostrils help to

(A) digest food
(B) pump blood
(C) trap dust and dirt
(D) absorb oxygen

Correct Answer: C

Explanation:

Hair and mucus trap dust particles.

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Question (8)

QN001518

Why is breathing through the nose preferred over breathing through the mouth?

(A) The nose helps in digestion
(B) The nose filters dust using hair and mucus
(C) The mouth absorbs oxygen better
(D) The mouth produces mucus

Correct Answer: B

Explanation:

The nose filters impurities from air.

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Question (9)

QN001519

The windpipe divides into two branches that enter the

(A) kidneys
(B) stomach
(C) lungs
(D) liver

Correct Answer: C

Explanation:

The windpipe branches enter the lungs.

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Question (10)

QN001520

The small balloon-like sacs present in the lungs are called

(A) villi
(B) alveoli
(C) nephrons
(D) bronchioles

Correct Answer: B

Explanation:

Alveoli are tiny air sacs in the lungs.

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Question (1)

Which process is called breathing?

Explanation:

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Question (2)

Respiration is the process in which

Explanation:

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Question (3)

Which gas is required for respiration in humans?

Explanation:

Link:

Question (4)

Which gas is released during respiration?

Explanation:

Link:

Question (5)

The system responsible for breathing in humans is called the

Explanation:

Link:

Question (6)

Air enters the body mainly through the

Explanation:

Link:

Question (7)

Tiny hair inside the nostrils help to

Explanation:

Link:

Question (8)

Why is breathing through the nose preferred over breathing through the mouth?

Explanation:

Link:

Question (9)

The windpipe divides into two branches that enter the

Explanation:

Link:

Question (10)

The small balloon-like sacs present in the lungs are called

Explanation:

Link:

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