Assertion: Gametophyte of homosporous pteridophyte does not depend on sporophytic body.
Reason: In homosporous pteridophytes there is ex situ or exosporic spore germination.

Options

A. If both assertion and Reason are true and the reason is a correct explanation of the assertion.
B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion and Reason are False.

Answer

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

### Step 1: Understand the Assertion
The assertion states that the gametophyte of homosporous pteridophytes does not depend on the sporophytic body.

- **Explanation**: In homosporous pteridophytes, the gametophyte is typically independent and can carry out its own life processes without relying on the sporophyte for nutrients or support.

### Step 2: Understand the Reason
The reason given is that in homosporous pteridophytes, there is ex situ or exosporic spore germination.

- **Explanation**: Ex situ or exosporic spore germination means that the spores germinate outside the parent plant (sporophyte) and develop into gametophytes independently. This supports the assertion that the gametophyte does not depend on the sporophyte.

### Step 3: Evaluate the Relationship
Now we need to determine if the reason correctly explains the assertion.

- Since the reason explains how the gametophyte can be independent due to the type of spore germination, it indeed supports the assertion.

### Conclusion
Both the assertion and the reason are true, and the reason is a correct explanation of the assertion.

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

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