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

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If both the assertion and reason are false

Answer

B

Explanation

Bull-form cells are large bubble shaped epidermal cells that occur in groups on the upper surface of leaves. Bull-form cells minimize the water loss during unfavorable or stress condition by making leaf curled inward so that leaf is exposed less and when the water supply is sufficient it causes leaf straightening permits the loss of water.