Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): For determination of leaf constants, only calculating stomatal number is not sufficient. Stomatal index should also be calculated.
Reason (R): The number of stomata in a young leaf and matured leaves are the same.
In the light of the above statements, choose the most appropriate answer from the options given below.