Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Bulliform cells present on the abaxial epidermis of grass leaves become flaccid under water stress. Reason (R): During dry weather, the leaves of grasses curl inwards to minimise water loss. In the light of the above statements, choose the most appropriate answer from the options given below:

Step-by-step solution

Assertion (A) is false because bulliform cells are modified epidermal cells present on the adaxial (upper) epidermis of grass leaves, not the abaxial (lower) epidermis. Reason (R) is true as during dry weather or water stress, the bulliform cells become flaccid, causing the leaves of grasses to curl inwards to minimise water loss. Therefore, Assertion is false but Reason is true. Answer: Assertion is false but Reason is true.