A: Orthotropous ovule has micropyle at the upper end.
R: Ovule is also called megasporangium.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Understand the Assertion
The assertion states that "Orthotropous ovule has micropyle at the upper end."
- An orthotropous ovule is characterized by its straight structure. In this type of ovule, the micropyle (the opening through which the pollen tube enters) is located at the upper end, opposite to the funicle (the stalk connecting the ovule to the ovary). This statement is true.

### Step 2: Understand the Reason
The reason states that "Ovule is also called megasporangium."
- The ovule is indeed referred to as a megasporangium because it is the structure that produces megaspores, which develop into female gametophytes. More specifically, it can be called an integumented megasporangium, as it has outer and inner integuments. This statement is also true.

### Step 3: Determine the Relationship Between Assertion and Reason
Now we need to evaluate whether the reason provided is a correct explanation for the assertion:
- While both statements are true, the reason does not explain why the micropyle is at the upper end of an orthotropous ovule. The assertion is about the position of the micropyle, while the reason discusses the classification of the ovule. Therefore, the reason does not adequately explain the assertion.

### Conclusion
Both the assertion (A) and the reason (R) are true, but R is not the correct explanation of A. Thus, the answer to the question is that both statements are correct, but the reason is not the correct explanation for the assertion.

### Final Answer
Both A and R are correct, but R is not the correct explanation of A.

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