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

1. Closure of stomata
2. Flaccidity of bulliform cells
3. Shrinkage of air spaces in spongy mesophyll
4. Ty loses in vessels

Correct answer: Flaccidity of bulliform cells

Solution

Grass leaves curl inward because bulliform cells lose water and become flaccid. This reduces the tension that keeps the leaf blade flat, so the leaf rolls inward to reduce water loss.

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