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Factors Affecting Transpiration

Assertion: Le...

Question

Assertion: Less water content in soil decreases transpiration in plants.

Reason: Dehydration leads to closure of stomata on the surface of leaves.

A

Assertion is true and Reason is false.

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B

Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.

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C

Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

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D

Both Assertion and Reason are false.

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Solution

The correct option is C
Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

Availability of soil water plays a significant role in the rate of transpiration in plants. If only a little water available in the soil, It results in dehydration of the leaf which causes closure of stomata and a consequent fall in transpiration. Such events usually occur during long periods of drought or when the soil is frozen or at a temperature so low that water cannot be absorbed by the roots.

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