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Question:

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following.

Closure of stomata

Tyloses in vessels

Flaccidity of Bulliform cells

Shrinkage of air spaces in spongy mesophyll

Solution:

Correct option is C. Flaccidity of Bulliform cells
Bulliform cells become flaccid due to water loss. This will make the leaves to curl inward to minimise water loss.So, the correct answer is 'Flaccidity of Bulliform cells'