Question

Assertion (A): Due to water stress the bulliform cells in grasses make the leaf curl outward to minimise water loss.
Reason (R): Bulliform cells are large, empty and colourless cells.
Identify the correct option from the following:

• A. Both (A) and (R) are true, and (R) is correct explanation of (A)
• B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

In assertion-reason questions, first check both statements independently, then verify if the reason logically explains the assertion.

Answer 1

The Correct Option is A

Step 1: Analyze Assertion (A)
In grasses, bulliform cells are specialized epidermal cells that help in leaf rolling during water stress to reduce transpiration. Hence, Assertion is correct. Step 2: Analyze Reason (R)
Bulliform cells are indeed large, empty, and colourless cells which enables them to collapse easily, causing leaf rolling. Hence, Reason is also correct. Step 3: Examine the explanation relationship
The Reason correctly explains the Assertion, as the structural nature of bulliform cells directly contributes to their water-saving function.