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Question

Assertion :Cork prevents the loss of water by evaporation. Reason: Cork cells contain tannins.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Cork consists of dead and compactly arranged rectangular cells that possess suberised cell walls. The cork cells contains tannins. Hence, they appear brown or dark brown in colour. The cork cells of some plants are filled with air. Cork prevents the loss of water by evaporation. It also protects the interior against entry of harmful micro-organisms, mechanical injury and extremes of temperature. Cork is light, compressible, nonreactive and sufficiently resistant to fire. It is used as stopper for bottles, shock absorption and insulation.

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