Opening of flower and drooping of a bud are

Options

A. Hyponasty
B. Epinasty
C. Curvature movement
D. Spontaneous movements

Answer

To solve the question regarding the opening of a flower and the drooping of a bud, we need to analyze the terms and concepts related to plant movements.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Hyponasty**: This refers to the upward bending of plant parts, typically due to increased growth on the lower side.
- **Aponasty**: This is the term used for the downward bending of plant parts, resulting from increased growth on the upper side.
- **Curvature Movements**: These are movements that involve bending in response to stimuli, such as phototropism (bending towards light).
- **Spontaneous Movements**: These are movements that occur without external stimuli, often due to internal factors, such as the movement of protoplasts in aquatic plants.

2. **Identifying the Correct Movement**:
- The question specifically asks about the opening of a flower and the drooping of a bud.
- The opening of a flower can be associated with the bending of the flower petals, which typically involves increased growth on the upper side, leading to a downward movement.
- Similarly, the drooping of a bud indicates that the bud is bending downwards, which also suggests aponastic movement.

3. **Conclusion**:
- Since both the opening of a flower and the drooping of a bud involve downward bending due to increased growth on the upper surface, they are classified as **aponasty**.
- Therefore, the correct answer to the question is **Aponasty**.