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Question (1)

QN001601

Which carbohydrate is mainly stored by plants as food?

(A) Protein
(B) Fat
(C) Starch
(D) Vitamin

Correct Answer: C

Explanation:

Plants store food in the form of starch.

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Question (2)

QN001602

Leaves are called the food factories of plants because they

(A) absorb minerals
(B) perform respiration only
(C) prepare food
(D) store seeds

Correct Answer: C

Explanation:

Leaves prepare food by photosynthesis.

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Question (3)

QN001603

The green colour of leaves is due to the presence of

(A) glucose
(B) chlorophyll
(C) starch
(D) iodine

Correct Answer: B

Explanation:

Chlorophyll gives leaves their green colour.

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Question (4)

QN001604

Chlorophyll mainly helps plants to

(A) absorb minerals from soil
(B) capture sunlight
(C) transport water
(D) release oxygen

Correct Answer: B

Explanation:

Chlorophyll captures sunlight for photosynthesis.

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Question (5)

QN001605

Which chemical is used to test the presence of starch in a leaf?

(A) Lime water
(B) Sodium hydroxide
(C) Iodine solution
(D) Alcohol

Correct Answer: C

Explanation:

Iodine solution tests for starch.

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Question (6)

QN001606

A blue-black colour in a leaf after iodine test confirms the presence of

(A) oxygen
(B) chlorophyll
(C) starch
(D) protein

Correct Answer: C

Explanation:

Blue-black colour indicates starch.

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Question (7)

QN001607

Why is a leaf boiled in water before performing the iodine test?

(A) To increase chlorophyll
(B) To soften the leaf
(C) To remove minerals
(D) To add starch

Correct Answer: B

Explanation:

Boiling softens the leaf.

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Question (8)

QN001608

In the starch test, alcohol is heated in a water bath because alcohol

(A) freezes easily
(B) is highly flammable
(C) changes colour quickly
(D) removes iodine

Correct Answer: B

Explanation:

Alcohol can catch fire easily.

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Question (9)

QN001609

Decolourisation of a leaf helps to

(A) destroy starch
(B) remove oxygen
(C) observe colour change clearly
(D) reduce water content

Correct Answer: C

Explanation:

Decolourisation makes the iodine test visible clearly.

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Question (10)

QN001610

In a variegated leaf exposed to sunlight, starch is formed mainly in the

(A) non-green parts
(B) green parts
(C) root region
(D) flower region

Correct Answer: B

Explanation:

Green parts contain chlorophyll.

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Question (1)

Which carbohydrate is mainly stored by plants as food?

Explanation:

Link:

Question (2)

Leaves are called the food factories of plants because they

Explanation:

Link:

Question (3)

The green colour of leaves is due to the presence of

Explanation:

Link:

Question (4)

Chlorophyll mainly helps plants to

Explanation:

Link:

Question (5)

Which chemical is used to test the presence of starch in a leaf?

Explanation:

Link:

Question (6)

A blue-black colour in a leaf after iodine test confirms the presence of

Explanation:

Link:

Question (7)

Why is a leaf boiled in water before performing the iodine test?

Explanation:

Link:

Question (8)

In the starch test, alcohol is heated in a water bath because alcohol

Explanation:

Link:

Question (9)

Decolourisation of a leaf helps to

Explanation:

Link:

Question (10)

In a variegated leaf exposed to sunlight, starch is formed mainly in the

Explanation:

Link:

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