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Question (31)

QN001631

Which combination is necessary for photosynthesis?

(A) Water, carbon dioxide, sunlight, and chlorophyll
(B) Oxygen, minerals, sunlight, and roots
(C) Nitrogen, chlorophyll, flowers, and sunlight
(D) Water, iodine, starch, and oxygen

Correct Answer: A

Explanation:

All these are essential for photosynthesis.

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Question (32)

QN001632

Which process directly helps maintain oxygen balance in nature?

(A) Respiration
(B) Germination
(C) Photosynthesis
(D) Digestion

Correct Answer: C

Explanation:

Photosynthesis releases oxygen.

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Question (33)

QN001633

In an experiment, a plant kept in sunlight forms starch, while another kept in darkness does not. This proves that

(A) minerals are essential
(B) sunlight is essential for food preparation
(C) roots produce starch
(D) oxygen forms food

Correct Answer: B

Explanation:

Sunlight is necessary for photosynthesis.

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Question (34)

QN001634

Which statement about chlorophyll is correct?

(A) It absorbs carbon dioxide from soil
(B) It captures sunlight for photosynthesis
(C) It transports food through stem
(D) It stores glucose in roots

Correct Answer: B

Explanation:

Chlorophyll captures light energy.

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Question (35)

QN001635

A leaf partially covered with black paper and kept in sunlight shows starch only in the uncovered area because

(A) water reached only uncovered area
(B) sunlight reached only uncovered area
(C) chlorophyll moved to uncovered area
(D) oxygen was absent in covered area

Correct Answer: B

Explanation:

Sunlight is needed for starch formation.

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Question (36)

QN001636

Which of the following is NOT required for photosynthesis?

(A) Carbon dioxide
(B) Sunlight
(C) Chlorophyll
(D) Nitrogen gas

Correct Answer: D

Explanation:

Nitrogen gas is not directly required.

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Question (37)

QN001637

Why are leaves generally broad and flat?

(A) To absorb more water
(B) To capture maximum sunlight
(C) To reduce oxygen release
(D) To store minerals

Correct Answer: B

Explanation:

Broad leaves capture more sunlight.

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Question (38)

QN001638

Which observation best proves that chlorophyll is essential for starch formation?

(A) Entire leaf turns blue-black
(B) Only green patches turn blue-black
(C) Roots absorb minerals
(D) Oxygen bubbles appear in water

Correct Answer: B

Explanation:

Only chlorophyll-containing parts form starch.

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Question (39)

QN001639

If all photosynthetic organisms disappeared from Earth, the amount of oxygen in the atmosphere would

(A) increase rapidly
(B) remain unchanged
(C) gradually decrease
(D) become poisonous

Correct Answer: C

Explanation:

Photosynthesis maintains oxygen levels.

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Question (40)

QN001640

Which ancient Indian text recorded observations about plant growth, soil, and agricultural practices?

(A) Arthashastra
(B) Charaka Samhita
(C) Vrikshayurveda
(D) Ramayana

Correct Answer: C

Explanation:

Vrikshayurveda contains knowledge about plant growth and farming.

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Question (31)

Which combination is necessary for photosynthesis?

Explanation:

Link:

Question (32)

Which process directly helps maintain oxygen balance in nature?

Explanation:

Link:

Question (33)

In an experiment, a plant kept in sunlight forms starch, while another kept in darkness does not. This proves that

Explanation:

Link:

Question (34)

Which statement about chlorophyll is correct?

Explanation:

Link:

Question (35)

A leaf partially covered with black paper and kept in sunlight shows starch only in the uncovered area because

Explanation:

Link:

Question (36)

Which of the following is NOT required for photosynthesis?

Explanation:

Link:

Question (37)

Why are leaves generally broad and flat?

Explanation:

Link:

Question (38)

Which observation best proves that chlorophyll is essential for starch formation?

Explanation:

Link:

Question (39)

If all photosynthetic organisms disappeared from Earth, the amount of oxygen in the atmosphere would

Explanation:

Link:

Question (40)

Which ancient Indian text recorded observations about plant growth, soil, and agricultural practices?

Explanation:

Link:

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