Question

Grass leaves curl inwards during very dry weather due to

• A. Flaccidity of bulliform cells
• B. Closure of stomata
• C. Tyloses in vessels
• D. Shrinkage of air spaces in spongy mesophyll

Answer 1

The correct option is A

Flaccidity of bulliform cells

The correct option is A.

Explanation of the correct option:

1. In monocots, bulliform cells are modified adaxial epidermal cells.
2. They become flaccid as a result of water loss in dry weather or when they are under water stress.
3. The leaves fold inwards to reduce water loss.

Final answer: During very dry weather, the grass leaves curl inward due to the flaccidity of bulliform cells.