Assertion :Bulliform cells are useful in the unrolling of leaf. Reason: Bulliform leaves store water.

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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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.
The large, bubble-shaped epidermal cells present on the upper surface of the leaves of many grasses are known as bulliform cells. This thin-walled empty cell is concerned with the storage of water. Loss of turgor pressure in these cells causes leaves to "roll up" during conditions of water stress preventing loss of moisture through the vacuoles. When adequate water is available, these cells enlarge and the leaves unroll.
Therefore, the correct answer is option B.

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