Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): ABA level is more when plant is under water stress
Reason (R): This is because when the plant is water stressed, the permeability of the chloroplast membranes to ABA increases and allows movement of the hormones to the epidermal cells including the guard cell
In light of the above statements, choose the correct answer from the options given below:

• A. Both (A) and (R) are true and (R) is the 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:

To remember the mechanism of stomatal closure, think of ABA as the "stress gatekeeper".
It acts as a rapid chemical signal that moves from the mesophyll storage sites to the guard cells within minutes of sensing water stress.

Answer 1

The Correct Option is A