Paper 1 · People, Development and Environment

Given below are two statements, an Assertion (A) and a Reason (R). Choose the correct answer.

Assertion (A):Hygroscopic and combined water are of no use to plants.

Reason (R):Some water is held in an extremely thin, tightly held film around soil particles, called hygroscopic water, and a small portion of soil water is chemically bound with soil materials, called combined water.

ABoth (A) and (R) are true and (R) is the correct explanation of (A) ✓ Correct

BBoth (A) and (R) are true but (R) is not the correct explanation of (A)

C(A) is true, but (R) is false

D(A) is false, but (R) is true

Correct answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A)

Explanation

Both statements are true and the reason correctly explains why hygroscopic and combined water are useless to plants.

The assertion is sound: hygroscopic and combined water cannot be taken up by plants.

The reason is sound: hygroscopic water clings in an extremely thin, tight film around soil particles, and combined water is chemically bound within soil materials.

Because both forms are held too tightly or locked chemically, roots cannot draw them, which is exactly why they are unavailable.

Only capillary water sitting between soil particles is freely available to plants.

Gravitational water, by contrast, drains away too quickly to be used.

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