The ovary which is unilocular with placentae present on the walls represents

Options

A. axile placentation
B. parietal placentation
C. apical placentation
D. free central placentation

Answer

To solve the question regarding the type of placentation represented by an unilocular ovary with placentae present on the walls, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- First, we need to understand what "unilocular" and "placentation" mean. A unilocular ovary has only one chamber, and placentation refers to the arrangement of ovules within that ovary.

2. **Identify the Types of Placentation**:
- The question provides several options:
- Axile placentation
- Parietal placentation
- Apical placentation
- Precentral placentation

3. **Analyze Each Option**:
- **Axile placentation**: This occurs in a multilocular ovary where ovules are attached to the central axis.
- **Parietal placentation**: This occurs in a unilocular ovary where ovules are attached to the inner walls of the ovary.
- **Apical placentation**: This is where ovules are attached at the apex of the ovary.
- **Precentral placentation**: This is not a commonly recognized term in standard botanical classifications.

4. **Determine the Correct Option**:
- Since the question specifies that the ovary is unilocular and the placentae are present on the walls, the correct answer is **parietal placentation**. This type of placentation is characterized by ovules developing on the inner walls of a unilocular ovary.

5. **Conclusion**:
- Therefore, the correct answer to the question is **option B: parietal placentation**.