Assertion :The rate of transpiration is indirectly proportional to relative humidity. Reason: If the outer air is humid, it will reduce the diffusion of water vapour from intercellular spaces of leaf to the outer atmosphere.

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

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

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason are correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Loss of water through stomata in form of water vapor is called as transpiration. The process occurs through diffusion and presence of the relatively higher amount of water vapor in the atmosphere (higher relative humidity) reduces the rate of transpiration by reducing the diffusion of water vapor from intercellular spaces (lesser humid) of leaf to the outer atmosphere (more humid). Thus, the correct answer is option A.

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