Family Brassicacease/Cruciferae is characterised by

Options

A. Marginal placenation
B. Parietal placentation
C. Basal placentation
D. Axile plancentation.

Answer

To answer the question about the characteristics of the family Brassicaceae (also known as Cruciferae), 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. Different plant families exhibit different types of placentation.

2. **Identifying Types of Placentation**:
- There are several types of placentation, including:
- **Marginal Placentation**: Ovules are arranged along the margin of the ovary (e.g., pea plant).
- **Axile Placentation**: Ovules are arranged in the center of a multilocular ovary (e.g., tomato, hibiscus).
- **Parietal Placentation**: Ovules are attached to the inner wall of a unilocular ovary (e.g., mustard).
- **Free Central Placentation**: Ovules are attached to a central column in a multilocular ovary (e.g., dianthus).
- **Basal Placentation**: A single ovule arises from the base of the ovary (e.g., marigold, sunflower).

3. **Characteristics of Brassicaceae**:
- The family Brassicaceae is primarily characterized by **parietal placentation**. This means that in the flowers of this family, the ovules are attached to the inner wall of a single-chambered ovary.

4. **Examples of Brassicaceae**:
- Mustard is the prototype plant of the Brassicaceae family and serves as a key example of parietal placentation.

5. **Conclusion**:
- Therefore, the family Brassicaceae is characterized by parietal placentation, which distinguishes it from other families.

### Final Answer:
The family Brassicaceae (Cruciferae) is characterized by **parietal placentation**.

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