Thermonastic movement is related to

Options

A. Light
B. Touch
C. Chemical
D. High temperature.

Answer

**Step-by-Step Solution:**

1. **Understanding Thermonastic Movement**: Thermonastic movement refers to the plant's response to temperature changes. It is a type of nastic movement, which is a non-directional response to stimuli.

2. **Identifying Stimuli Types**: Plants can respond to various environmental stimuli, including light, touch, chemicals, and temperature. Each type of response has a specific name:
- **Photonastic Response**: Response to light.
- **Thigmonastic Response**: Response to touch.
- **Chemonastic Response**: Response to chemicals.

3. **Focusing on Temperature Response**: The question specifically asks about thermonastic movement, which is related to temperature changes. This means that the plant's movement or growth is triggered by variations in temperature.

4. **Examples of Thermonastic Movements**:
- **Stomatal Closure**: High temperatures can cause the stomata (tiny openings on leaves) to close, which helps reduce water loss.
- **Flower Opening and Closing**: Some flowers open or close based on temperature, responding to the warmth of the day or the coolness of the night.

5. **Conclusion**: Based on the understanding of thermonastic movements and their relation to temperature, we conclude that thermonastic movement is specifically related to temperature stimuli.

**Final Answer**: Thermonastic movement is related to temperature stimuli.

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