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Question (11)

QN001521

Gas exchange in humans mainly occurs in the

(A) nostrils
(B) windpipe
(C) alveoli
(D) diaphragm

Correct Answer: C

Explanation:

Oxygen and carbon dioxide exchange occurs in alveoli.

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Question (12)

QN001522

Which structure protects the lungs?

(A) Skull
(B) Rib cage
(C) Backbone
(D) Pelvis

Correct Answer: B

Explanation:

The rib cage protects the lungs.

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Question (13)

QN001523

During inhalation, the ribs move

(A) down and inward
(B) upward and outward
(C) backward only
(D) forward only

Correct Answer: B

Explanation:

Ribs move upward and outward during inhalation.

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Question (14)

QN001524

During exhalation, the diaphragm moves

(A) downward
(B) outward
(C) upward
(D) sideways

Correct Answer: C

Explanation:

The diaphragm moves upward during exhalation.

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Question (15)

QN001525

Which statement correctly describes inhalation?

(A) Air is forced out of the lungs
(B) Chest cavity becomes smaller
(C) Air enters the lungs
(D) Diaphragm moves upward

Correct Answer: C

Explanation:

Inhalation brings air into the lungs.

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Question (16)

QN001526

In the breathing model activity, the balloons represent the

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

Correct Answer: B

Explanation:

Balloons represent lungs in the model.

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Question (17)

QN001527

In the breathing model activity, the rubber sheet represents the

(A) rib cage
(B) windpipe
(C) diaphragm
(D) alveoli

Correct Answer: C

Explanation:

The rubber sheet acts like the diaphragm.

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Question (18)

QN001528

What happens to the balloons in the breathing model when the rubber sheet is pulled downward?

(A) They burst
(B) They deflate
(C) They inflate
(D) They change colour

Correct Answer: C

Explanation:

Pulling the sheet downward inflates the balloons.

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Question (19)

QN001529

Pulling the rubber sheet downward in the breathing model mainly increases the

(A) temperature inside the bottle
(B) pressure outside the bottle
(C) space inside the bottle
(D) colour of the balloons

Correct Answer: C

Explanation:

Increased space allows air to enter.

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Question (20)

QN001530

Which statement best explains exhalation?

(A) Oxygen enters the blood
(B) Carbon dioxide enters the lungs from blood and is removed
(C) Food is digested in alveoli
(D) Air pressure in lungs increases permanently

Correct Answer: B

Explanation:

Carbon dioxide is expelled during exhalation.

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Question (11)

Gas exchange in humans mainly occurs in the

Explanation:

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Question (12)

Which structure protects the lungs?

Explanation:

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Question (13)

During inhalation, the ribs move

Explanation:

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Question (14)

During exhalation, the diaphragm moves

Explanation:

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Question (15)

Which statement correctly describes inhalation?

Explanation:

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Question (16)

In the breathing model activity, the balloons represent the

Explanation:

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Question (17)

In the breathing model activity, the rubber sheet represents the

Explanation:

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Question (18)

What happens to the balloons in the breathing model when the rubber sheet is pulled downward?

Explanation:

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Question (19)

Pulling the rubber sheet downward in the breathing model mainly increases the

Explanation:

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Question (20)

Which statement best explains exhalation?

Explanation:

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