Assertion : The primany protenema of moss by death and decay of cells may break into fragments.
Reason : Each fragment gives gives rise to leafy gametophyte.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reson are false.

Explanation

To solve the assertion-reason question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the primary protonema of moss can break into fragments due to the death and decay of cells.
- Protonema is the initial stage of the moss life cycle that develops from the spore and is typically a filamentous structure.

2. **Understanding the Reason**:
- The reason states that each fragment of the protonema can give rise to a leafy gametophyte.
- The leafy gametophyte is the dominant stage in the life cycle of moss and is responsible for producing gametes.

3. **Analyzing the Relationship**:
- The assertion is true because the protonema can indeed break into fragments as it decays.
- The reason is also true because each of these fragments can develop into a new leafy gametophyte.

4. **Conclusion**:
- Since both the assertion and the reason are true, and the reason correctly explains the assertion, we conclude that both statements are correct and the reason is a valid explanation of the assertion.

### Final Answer:
Both the assertion and the reason are true, and the reason is a correct explanation of the assertion.