Parietal placentation is observed in

Options

A. Dianthus
B. Pisum
C. Primrose
D. Argemone

Answer

To determine which plant exhibits parietal placentation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Placentation**:
- Placentation refers to the arrangement of ovules within the ovary of a flower. Different types of placentation include marginal, axile, parietal, free central, and basal.

2. **Identify Parietal Placentation**:
- In parietal placentation, the ovules are attached to the wall of a unilocular ovary or to the partitions of a multilocular ovary. This means that the ovules are located along the sides of the ovary rather than in the center.

3. **Review the Options**:
- The options given are:
- A) Dianthus
- B) Prism
- C) Primrose
- D) Argument

4. **Recall Examples of Parietal Placentation**:
- Common examples of plants with parietal placentation include mustard and Argemone.

5. **Analyze Each Option**:
- **Dianthus**: Known for free central placentation.
- **Prism**: Not a commonly recognized plant in this context.
- **Primrose**: Typically has free central placentation.
- **Argument**: Known to exhibit parietal placentation.

6. **Select the Correct Answer**:
- Based on the analysis, the correct answer is **D) Argument**, as it is the only option that fits the criteria for parietal placentation.

### Final Answer:
The correct answer is **D) Argument**.