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Question

Assertion :Water in liquid form reaches to plant surfaces in transpiration process. Reason: At plant surfaces water changes from liquid to vapour phase.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is D Both Assertion and Reason are incorrect
The intercellular spaces of the transpiring organs is almost saturated with water vapours. When the stomata are open the water vapours are drawn from the substomatal cavities to the outside air due to high DPD of the latter. This increase the DPD of the substomatal air which draws more water vapours from the intercellular spaces. The latter in turn get water vapours from the wet walls of mesophyll cell.
So, the correct answer is 'Both Assertion and Reason are incorrect'.

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