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Question (11)

QN001571

A variegated leaf kept in darkness did not turn blue-black after iodine test because

(A) chlorophyll was absent
(B) starch was not formed
(C) iodine was weak
(D) water was absent

Correct Answer: B

Explanation:

Starch is not formed in absence of sunlight.

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Question (12)

QN001572

Which conclusion can be drawn from Activity 10.3?

(A) Water alone forms starch
(B) Chlorophyll is essential for starch formation
(C) Roots prepare food
(D) Oxygen forms starch

Correct Answer: B

Explanation:

Chlorophyll is necessary for photosynthesis.

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Question (13)

QN001573

Some leaves appear red or violet because

(A) chlorophyll is absent completely
(B) starch changes colour
(C) other pigments hide the green chlorophyll
(D) minerals accumulate in leaves

Correct Answer: C

Explanation:

Other pigments mask the green colour of chlorophyll.

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Question (14)

QN001574

In Activity 10.4, caustic soda was used because it

(A) releases oxygen
(B) absorbs carbon dioxide
(C) removes chlorophyll
(D) produces starch

Correct Answer: B

Explanation:

Caustic soda absorbs carbon dioxide from air.

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Question (15)

QN001575

The part of the leaf inside the bottle containing caustic soda did not turn blue-black because it lacked

(A) sunlight
(B) water
(C) carbon dioxide
(D) chlorophyll

Correct Answer: C

Explanation:

Carbon dioxide is essential for starch formation.

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Question (16)

QN001576

Photosynthesis is defined as the process by which plants prepare food using

(A) oxygen and minerals
(B) sunlight, chlorophyll, water, and carbon dioxide
(C) proteins and vitamins
(D) nitrogen and oxygen

Correct Answer: B

Explanation:

Photosynthesis needs sunlight, chlorophyll, water, and carbon dioxide.

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Question (17)

QN001577

The primary site of photosynthesis in plants is the

(A) root
(B) stem
(C) flower
(D) leaf

Correct Answer: D

Explanation:

Leaves are called the food factories of plants.

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Question (18)

QN001578

Which gas is released during photosynthesis?

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

Correct Answer: C

Explanation:

Oxygen is released during photosynthesis.

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Question (19)

QN001579

In Activity 10.5, bubbles were observed only in the setup kept in sunlight because

(A) respiration stopped
(B) oxygen was released during photosynthesis
(C) water evaporated rapidly
(D) carbon dioxide was released

Correct Answer: B

Explanation:

Oxygen bubbles are produced during photosynthesis.

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Question (20)

QN001580

A glowing matchstick burns more brightly in the collected gas because the gas is rich in

(A) hydrogen
(B) oxygen
(C) nitrogen
(D) carbon dioxide

Correct Answer: B

Explanation:

Oxygen supports burning.

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Question (11)

A variegated leaf kept in darkness did not turn blue-black after iodine test because

Explanation:

Link:

Question (12)

Which conclusion can be drawn from Activity 10.3?

Explanation:

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Question (13)

Some leaves appear red or violet because

Explanation:

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Question (14)

In Activity 10.4, caustic soda was used because it

Explanation:

Link:

Question (15)

The part of the leaf inside the bottle containing caustic soda did not turn blue-black because it lacked

Explanation:

Link:

Question (16)

Photosynthesis is defined as the process by which plants prepare food using

Explanation:

Link:

Question (17)

The primary site of photosynthesis in plants is the

Explanation:

Link:

Question (18)

Which gas is released during photosynthesis?

Explanation:

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Question (19)

In Activity 10.5, bubbles were observed only in the setup kept in sunlight because

Explanation:

Link:

Question (20)

A glowing matchstick burns more brightly in the collected gas because the gas is rich in

Explanation:

Link:

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