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Question (31)

QN005512

A plant gains 1.5 cm in height every week. What is the increase after 4 weeks?

(A) 4 cm
(B) 5 cm
(C) 6 cm
(D) 7 cm

Correct Answer: C

Explanation:

1.5 × 4 = 6 cm.

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Question (32)

QN005513

Which scientist from India designed the crescograph to study plant growth?

(A) C. V. Raman
(B) Homi Bhabha
(C) Jagadish Chandra Bose
(D) Vikram Sarabhai

Correct Answer: C

Explanation:

It was designed by Jagadish Chandra Bose.

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Question (33)

QN005514

The crescograph was developed to:

(A) Measure rainfall
(B) Observe plant growth accurately
(C) Count seeds
(D) Measure soil depth

Correct Answer: B

Explanation:

It is used to study plant growth.

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Question (34)

QN005515

A student records plant heights as 6 cm, 9 cm, 13 cm and 18 cm over four observations. What is the total increase from first to last observation?

(A) 10 cm
(B) 11 cm
(C) 12 cm
(D) 24 cm

Correct Answer: C

Explanation:

Increase = 18 − 6 = 12 cm.

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Question (35)

QN005516

Which of the following is NOT an example of growth in plants?

(A) Increase in root length
(B) Increase in stem height
(C) Development of new leaves
(D) A branch moving due to wind

Correct Answer: D

Explanation:

Wind movement is not growth.

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Question (36)

QN005517

A seedling kept in darkness for a few days still shows growth because:

(A) Growth can continue for some time using stored food.
(B) Light is converted into roots.
(C) Darkness increases reproduction.
(D) Roots produce sunlight.

Correct Answer: A

Explanation:

Stored food supports initial growth.

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Question (37)

QN005518

Which statement is correct regarding plant movement?

(A) Plants never move.
(B) Only roots move.
(C) Plants can show movement in response to stimuli.
(D) Movement occurs only in flowers.

Correct Answer: C

Explanation:

Plants respond to environmental stimuli.

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Question (38)

QN005519

If the height of a plant doubles from 9 cm to 18 cm, the increase in height is:

(A) 7 cm
(B) 8 cm
(C) 9 cm
(D) 18 cm

Correct Answer: C

Explanation:

Increase = 18 − 9 = 9 cm.

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Question (39)

QN005520

A gardener rotates a flower pot by 180°. After a few days, the shoot bends again toward sunlight. This demonstrates:

(A) Excretion
(B) Reproduction
(C) Response and movement in plants
(D) Seed dispersal

Correct Answer: C

Explanation:

Shoots show phototropism again toward light.

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Question (40)

QN005521

Which conclusion is best supported by observations of roots growing downward and shoots growing upward?

(A) Plants do not respond to their surroundings.
(B) Plant growth occurs in specific directions.
(C) Only roots are living.
(D) Shoots never change direction.

Correct Answer: B

Explanation:

Plants show directional growth (geotropism).

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Question (31)

A plant gains 1.5 cm in height every week. What is the increase after 4 weeks?

Explanation:

Link:

Question (32)

Which scientist from India designed the crescograph to study plant growth?

Explanation:

Link:

Question (33)

The crescograph was developed to:

Explanation:

Link:

Question (34)

A student records plant heights as 6 cm, 9 cm, 13 cm and 18 cm over four observations. What is the total increase from first to last observation?

Explanation:

Link:

Question (35)

Which of the following is NOT an example of growth in plants?

Explanation:

Link:

Question (36)

A seedling kept in darkness for a few days still shows growth because:

Explanation:

Link:

Question (37)

Which statement is correct regarding plant movement?

Explanation:

Link:

Question (38)

If the height of a plant doubles from 9 cm to 18 cm, the increase in height is:

Explanation:

Link:

Question (39)

A gardener rotates a flower pot by 180°. After a few days, the shoot bends again toward sunlight. This demonstrates:

Explanation:

Link:

Question (40)

Which conclusion is best supported by observations of roots growing downward and shoots growing upward?

Explanation:

Link:

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