The mode of arrangement of sepals or petals in floral bud is known as :-

Options

A. Phyllotaxy
B. Aestivation
C. Placentation
D. Ptyxis

Answer

To answer the question regarding the mode of arrangement of sepals or petals in a floral bud, we can follow these steps:

1. **Understanding Floral Buds**: Floral buds are the undeveloped flowers that contain sepals and petals. The sepals are collectively known as the calyx, and the petals are known as the corolla.

2. **Identifying the Arrangement**: The arrangement of sepals and petals in a floral bud refers to how these structures are positioned relative to each other on the thalamus (also called the receptacle).

3. **Terminology**: The specific term used to describe the arrangement of sepals and petals in a floral bud is "Aestivation." Aestivation refers to the pattern of arrangement of the petals and sepals in relation to one another before the flower opens.

4. **Types of Aestivation**: There are different types of aestivation, including:
- **Valvate**: Sepals or petals touch each other at the edges without overlapping.
- **Twisted**: One petal overlaps the next one in a spiral manner.
- **Imbricate**: The petals or sepals overlap each other, but not in a regular pattern.
- **Regulate**: The arrangement is such that the petals or sepals are arranged in a regular manner.

5. **Conclusion**: Therefore, the correct answer to the question is that the mode of arrangement of sepals or petals in a floral bud is known as "Aestivation."