Question

Assertion (A): Folding and rolling movements in certain grasses are caused by the loss of turgor in bulliform cell.
Reason (R): Bulliform cell are found in the horizontal rows in the leaf epidermis.

• A. Both A and Rare individually true and R is the correct explanation of A
• B. Both A and Rare individually true and R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true Assertion

Answer 1

Answer: (B)

Both A and Rare individually true and R is not the correct explanation of A

Bulliform cells are large, colorless cells present on the adaxial surface of monocot leaves. For example, wheat, rice, etc. During water stress conditions these cells lose water or become flaccid which results in the rolling in or folding of the leaves. This prevents excess loss of water due to transpiration.

So, the correct answer is option B.