Question

Given below are two statements: One labelled as Assertion A and the other labelled as Reason R:
Assertion A: The first stage of gametophyte in the life cycle of moss is protonema stage.
Reason R: Protonema develops directly from spores produced in capsule.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both A and R are correct but R is not the correct explanation of A
• B. A is correct but R is not correct
• C. A is not correct but R is correct
• D. Both A and R are correct and R is correct explanation of A

Answer 1

The Correct Option is D

To determine the most appropriate answer for the given Assertion and Reason, let's analyze each statement within the context of moss life cycle.

Assertion A: The first stage of gametophyte in the life cycle of moss is protonema stage. This statement is correct. Mosses undergo an alternation of generations, where the gametophyte is the dominant phase. It begins with a protonema, which is a filamentous structure developing from a spore.

Reason R: Protonema develops directly from spores produced in capsule. This statement is correct. In mosses, the spores are produced in the capsule of the sporophyte. When these spores germinate, they form the protonema, marking the beginning of the gametophyte generation.

Considering both statements, they are correct and coherent. The Reason R directly explains the Assertion A by detailing how the protonema, as the initial stage of gametophyte, arises from spores in mosses.

Thus, the correct answer is: Both A and R are correct and R is the correct explanation of A.

Answer 2

The protonema stage is indeed the first stage of the gametophyte in the life cycle of mosses. Additionally, protonema does develop directly from spores produced in the capsule, supporting Assertion A. Therefore, Reason R explains why Assertion A is true.

So, the correct option is (A): Both A and R are correct and R is correct explanation of A.