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Question (41)

QN001551

Fish mainly breathe through

(A) lungs
(B) skin
(C) spiracles
(D) gills

Correct Answer: D

Explanation:

Fish use gills for breathing.

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Question (42)

QN001552

Exchange of gases in fish occurs through structures richly supplied with

(A) muscles only
(B) blood vessels
(C) bones
(D) nerves only

Correct Answer: B

Explanation:

Gills contain many blood vessels.

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Question (43)

QN001553

Tadpoles mainly breathe through

(A) lungs
(B) skin
(C) gills
(D) spiracles

Correct Answer: C

Explanation:

Tadpoles breathe through gills.

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Question (44)

QN001554

Adult frogs mainly use which organ for breathing on land?

(A) Gills
(B) Lungs
(C) Scales
(D) Fins

Correct Answer: B

Explanation:

Adult frogs use lungs on land.

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Question (45)

QN001555

Earthworms exchange gases mainly through their

(A) lungs
(B) gills
(C) moist skin
(D) fins

Correct Answer: C

Explanation:

Earthworms respire through moist skin.

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Question (46)

QN001556

Which statement best explains adaptation in respiration among animals?

(A) All animals use lungs only
(B) Different animals have breathing organs suited to their habitats
(C) Respiration occurs only in water animals
(D) Fish breathe exactly like humans

Correct Answer: B

Explanation:

Animals have adapted breathing structures.

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Question (47)

QN001557

A fish taken out of water struggles to breathe mainly because

(A) its stomach stops working
(B) gills cannot function properly outside water
(C) its blood circulation stops immediately
(D) oxygen is absent in air

Correct Answer: B

Explanation:

Gills need water for proper gas exchange.

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Question (48)

QN001558

Which pair is correctly matched?

(A) Fish — lungs
(B) Earthworm — moist skin
(C) Frog tadpole — lungs
(D) Human — gills

Correct Answer: B

Explanation:

Earthworms breathe through moist skin.

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Question (49)

QN001559

A person exhales into lime water and it turns cloudy. What does this prove?

(A) Exhaled air contains glucose
(B) Exhaled air contains more oxygen
(C) Exhaled air contains carbon dioxide
(D) Exhaled air contains no gases

Correct Answer: C

Explanation:

Carbon dioxide makes lime water cloudy.

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Question (50)

QN001560

Which of the following is most essential for releasing energy from food during respiration?

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

Correct Answer: C

Explanation:

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Question (41)

Fish mainly breathe through

Explanation:

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Question (42)

Exchange of gases in fish occurs through structures richly supplied with

Explanation:

Link:

Question (43)

Tadpoles mainly breathe through

Explanation:

Link:

Question (44)

Adult frogs mainly use which organ for breathing on land?

Explanation:

Link:

Question (45)

Earthworms exchange gases mainly through their

Explanation:

Link:

Question (46)

Which statement best explains adaptation in respiration among animals?

Explanation:

Link:

Question (47)

A fish taken out of water struggles to breathe mainly because

Explanation:

Link:

Question (48)

Which pair is correctly matched?

Explanation:

Link:

Question (49)

A person exhales into lime water and it turns cloudy. What does this prove?

Explanation:

Link:

Question (50)

Which of the following is most essential for releasing energy from food during respiration?

Explanation:

Link:

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