Response of plants due to reversibole turgor change in pulvinus as a result of touch is

Options

A. Photonasty
B. Thermonasty
C. Seismonasty
D. Chemonasty.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the response of plants due to reversible turgor changes in the pulvinus as a result of touch. We need to identify the correct term that describes this phenomenon.

2. **Defining Nastic Movements**: Nastic movements are defined as non-directional movements of plants in response to various stimuli. They are not oriented towards or away from the stimulus but occur in a specific manner based on the type of stimulus.

3. **Identifying Types of Nastic Movements**:
- **Photonasty**: This is the movement in response to light.
- **Thermonasty**: This refers to movements in response to temperature changes.
- **Sysmonasty**: This is the movement in response to touch.
- **Chemonasty**: This involves movements in response to chemical stimuli.

4. **Focusing on the Given Stimulus**: The question specifically mentions "touch" as the stimulus. Therefore, we need to identify which type of nastic movement corresponds to touch.

5. **Selecting the Correct Answer**: Since the question specifies that the movement is due to touch, the correct answer is **Sysmonasty**. This is the term used to describe the non-directional movement of plants in response to touch, which involves reversible turgor changes in the pulvinus.

6. **Final Answer**: The correct response of plants due to reversible turgor changes in the pulvinus as a result of touch is **Sysmonasty**.