Parietal placentation is present in

Options

A. China rose
B. Argemone
C. Dianthus
D. Lemon

Answer

### Step-by-Step Solution:

1. **Understanding Parietal Placentation**:
- Parietal placentation refers to the arrangement of ovules in an ovary where they are attached to the inner wall of the ovary. This type of placentation is typically found in unilocular (one chamber) syncarpous (multiple carpels fused together) ovaries.

2. **Identifying Characteristics**:
- In parietal placentation, the ovules develop along the inner walls of the ovary rather than being attached to a central column or axis. This is a key characteristic that distinguishes it from other types of placentation.

3. **Examples of Plants with Parietal Placentation**:
- Common examples of plants that exhibit parietal placentation include mustard (Brassica) and other members of the Brassicaceae family.

4. **Conclusion**:
- Therefore, parietal placentation is present in plants like mustard. The correct answer to the question is option number 2.