Give one difference between each of the following pairs on the basis of what is given in the brackets:
Hydrotropism and Thigmotropism (stimulus)

Explanation

To answer the question regarding the difference between hydrotropism and thigmotropism based on the stimulus, we can follow these steps:

### Step-by-Step Solution:

1. **Define Hydrotropism**:
- Hydrotropism is the growth or movement of a plant in response to water. It is primarily observed in the roots of plants, which tend to grow towards moisture.

2. **Identify the Stimulus for Hydrotropism**:
...