In which type of placentation, the ovules develop on the inner wall of the ovary :-

Options

A. Marginal
B. Parietal
C. Axile
D. Free central

Answer

To answer the question regarding the type of placentation in which the ovules develop on the inner wall of the ovary, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Placentation**: Placentation refers to the arrangement of ovules within the ovary of a flower. It is important to know where the ovules are located to determine the type of placentation.

2. **Identifying Types of Placentation**: There are several types of placentation, including:
- Marginal
- Parietal
- Axile
- Free central

3. **Analyzing Parietal Placentation**: In parietal placentation, the ovules are attached to the inner wall of the ovary. This means that they develop along the sides of the ovary rather than being clustered in the center or along a single line.

4. **Comparing with Other Types**:
- **Marginal Placentation**: Ovules are attached along the margin of a single carpel.
- **Axile Placentation**: Ovules are attached to a central column (axis) within the ovary.
- **Free Central Placentation**: Ovules are attached to a central mass but are not on the walls.

5. **Conclusion**: Based on the analysis, the type of placentation where the ovules develop on the inner wall of the ovary is called **parietal placentation**.

6. **Example**: An example of a plant that exhibits parietal placentation is mustard.

### Final Answer:
The type of placentation in which the ovules develop on the inner wall of the ovary is **parietal placentation**.

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