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Question (11)

QN001611

Non-green patches of a variegated leaf generally do not turn blue-black because they contain

(A) excess water
(B) no oxygen
(C) insufficient chlorophyll
(D) excess starch

Correct Answer: C

Explanation:

Chlorophyll is necessary for starch formation.

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Question (12)

QN001612

A green leaf kept in darkness for 36 hours fails to show blue-black colour with iodine because

(A) chlorophyll disappears completely
(B) starch is not formed
(C) iodine becomes ineffective
(D) oxygen is absent

Correct Answer: B

Explanation:

No sunlight means no starch formation.

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Question (13)

QN001613

Which condition is essential for starch formation in leaves?

(A) Presence of chlorophyll and sunlight
(B) Presence of oxygen only
(C) Presence of minerals only
(D) Presence of roots only

Correct Answer: A

Explanation:

Chlorophyll and sunlight are necessary.

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Question (14)

QN001614

In the experiment showing the role of air in food preparation, caustic soda was used to absorb

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

Correct Answer: C

Explanation:

Caustic soda absorbs carbon dioxide.

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Question (15)

QN001615

The part of the leaf inside the bottle containing caustic soda did not form starch because

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

Correct Answer: B

Explanation:

Carbon dioxide is essential for photosynthesis.

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Question (16)

QN001616

Which gas from the air is essential for photosynthesis?

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

Correct Answer: C

Explanation:

Plants use carbon dioxide during photosynthesis.

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Question (17)

QN001617

Photosynthesis is the process by which plants prepare food in the presence of sunlight and

(A) iodine
(B) chlorophyll
(C) oxygen
(D) minerals

Correct Answer: B

Explanation:

Chlorophyll is necessary for photosynthesis.

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Question (18)

QN001618

Which part of the plant is the primary site of photosynthesis?

(A) Root
(B) Stem
(C) Leaf
(D) Flower

Correct Answer: C

Explanation:

Leaves are the main site of photosynthesis.

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Question (19)

QN001619

During photosynthesis, plants use carbon dioxide and water to produce

(A) protein and minerals
(B) glucose and oxygen
(C) oxygen and nitrogen
(D) starch and minerals

Correct Answer: B

Explanation:

Photosynthesis produces glucose and oxygen.

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Question (20)

QN001620

Which of the following is released during photosynthesis?

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

Correct Answer: B

Explanation:

Oxygen is released during photosynthesis.

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Question (11)

Non-green patches of a variegated leaf generally do not turn blue-black because they contain

Explanation:

Link:

Question (12)

A green leaf kept in darkness for 36 hours fails to show blue-black colour with iodine because

Explanation:

Link:

Question (13)

Which condition is essential for starch formation in leaves?

Explanation:

Link:

Question (14)

In the experiment showing the role of air in food preparation, caustic soda was used to absorb

Explanation:

Link:

Question (15)

The part of the leaf inside the bottle containing caustic soda did not form starch because

Explanation:

Link:

Question (16)

Which gas from the air is essential for photosynthesis?

Explanation:

Link:

Question (17)

Photosynthesis is the process by which plants prepare food in the presence of sunlight and

Explanation:

Link:

Question (18)

Which part of the plant is the primary site of photosynthesis?

Explanation:

Link:

Question (19)

During photosynthesis, plants use carbon dioxide and water to produce

Explanation:

Link:

Question (20)

Which of the following is released during photosynthesis?

Explanation:

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