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Question (21)

QN0036092

21 The brain is protected by a bony structure called the

(A) Rib cage
(B) Skull
(C) Vertebral column
(D) Sternum

Correct Answer: B

Explanation:

The skull protects the brain.

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Question (22)

QN0036093

22 Which structure protects the spinal cord?

(A) Skull
(B) Vertebral column
(C) Rib cage
(D) Pelvic girdle

Correct Answer: B

Explanation:

The vertebral column protects the spinal cord.

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Question (23)

QN0036094

23 When a nerve impulse reaches a muscle cell, the muscle produces movement mainly by

(A) Increasing its length permanently
(B) Changing shape and shortening
(C) Producing hormones
(D) Absorbing light

Correct Answer: B

Explanation:

Changes in the arrangement of proteins cause muscle cells to shorten.

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Question (24)

QN0036095

24 A sensitive plant folds its leaves when touched. Which statement correctly explains this movement?

(A) It always occurs due to growth
(B) It is a rapid movement independent of growth
(C) It requires muscles
(D) It is caused only by gravity

Correct Answer: B

Explanation:

The sensitive plant shows rapid movement in response to touch without growth.

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Question (25)

QN0036096

25 How do plants communicate information from one cell to another despite having no specialised nervous tissue?

(A) Only through blood
(B) Through electrical-chemical means
(C) Through bones
(D) Through muscles

Correct Answer: B

Explanation:

Plants use electrical-chemical means to transmit information.

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Question (26)

QN0036097

26 When cells of a sensitive plant change their shape in response to touch, which change is mainly involved?

(A) Change in amount of water in cells
(B) Formation of bones
(C) Production of blood
(D) Increase in chlorophyll only

Correct Answer: A

Explanation:

Plant cells can change shape by changing their water content.

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Question (27)

QN0036098

27 A seedling grows with its shoot towards light. This is an example of

(A) Reflex action
(B) Phototropism
(C) Chemotropism
(D) Geotropism

Correct Answer: B

Explanation:

Directional growth in response to light is called phototropism.

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Question (28)

QN0036099

28 If a plant root grows away from light while the shoot grows towards light, which statement is correct?

(A) Both show the same response to light
(B) Shoot and root can show different phototropic responses
(C) Neither response is related to light
(D) Both movements are reflex actions

Correct Answer: B

Explanation:

Shoots generally grow towards light, while roots grow away from light.

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Question (29)

QN0036100

29 The downward growth of roots in response to gravity is called

(A) Phototropism
(B) Hydrotropism
(C) Geotropism
(D) Chemotropism

Correct Answer: C

Explanation:

Directional growth in response to gravity is called geotropism.

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Question (30)

QN0036101

30 A pollen tube grows towards an ovule due to a chemical stimulus. This is an example of

(A) Phototropism
(B) Chemotropism
(C) Geotropism
(D) Hydrotropism

Correct Answer: B

Explanation:

Chemotropism is directional growth in response to chemicals.

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Question (21)

21 The brain is protected by a bony structure called the

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Question (22)

22 Which structure protects the spinal cord?

Explanation:

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Question (23)

23 When a nerve impulse reaches a muscle cell, the muscle produces movement mainly by

Explanation:

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Question (24)

24 A sensitive plant folds its leaves when touched. Which statement correctly explains this movement?

Explanation:

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Question (25)

25 How do plants communicate information from one cell to another despite having no specialised nervous tissue?

Explanation:

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Question (26)

26 When cells of a sensitive plant change their shape in response to touch, which change is mainly involved?

Explanation:

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Question (27)

27 A seedling grows with its shoot towards light. This is an example of

Explanation:

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Question (28)

28 If a plant root grows away from light while the shoot grows towards light, which statement is correct?

Explanation:

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Question (29)

29 The downward growth of roots in response to gravity is called

Explanation:

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Question (30)

30 A pollen tube grows towards an ovule due to a chemical stimulus. This is an example of

Explanation:

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