NEET · Biology · STD 11 - 3. Plant kingdom

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 options given below:

A \(A\) is not correct but \(R\) is correct
B Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\)
C Both \(A\) and \(R\) are correct but \(R\) is NOT the correct explanation of \(A\)
D \(A\) is correct but \(R\) is not correct

Verified Solution

Answer & Solution

Correct Answer

(B) Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\)

Step-by-step Solution

Detailed explanation

The predominant stage of the life cycle of a moss is the gametophyte which consists of two stages. The first stage is the protonema stage, which develops directly from a spore. Capsule of the sporophyte contains spore which gives rise to protonema. Thus, reason correctly explains the assertion.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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