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Byju's Answer
Standard XII
Biology
Transpiration and Photosynthesis
Assertion :A ...
Question

Assertion :(A) : The rate of transpiration decreases in dry atmosphere. Reason: (R) : In humid atmosphere, the rate of transpiration decreases.

A
If both Assertion and Reason are true; Reason is the correct explanation of Assertion.
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B
If both Assertion and Reason are true; but Reason is not the correct explanation of Assertion.
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C
If Assertion is true but Reason is false.
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D
If Assertion is false but Reason is true.
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Solution

The correct option is D If Assertion is false but Reason is true.
Relative humidity – Relative humidity (RH) is the amount of water vapor in the air compared to the amount of water vapor that air could hold at a given temperature. A hydrated leaf would have a RH near 100%, just as the atmosphere on a rainy day would have. Any reduction in water in the atmosphere creates a gradient for water to move from the leaf to the atmosphere. The lower the RH, the less moist the atmosphere and thus, the greater the driving force for transpiration. When RH is high, the atmosphere contains more moisture, reducing the driving force for transpiration. The rate of transpiration increases in dry atmosphere.
Therefore, the correct answer is option D.

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