Guttation take place during night when

Options

A. Root pressure is positive
B. Root pressure is negative
C. Always take place
D. It does not takes place at all

Answer

### Step-by-Step Solution:

1. **Understanding Guttation**: Guttation is the process by which water droplets are exuded from the pores (hydathodes) of plants, usually occurring at night or early morning.

2. **Role of Root Pressure**: Guttation is primarily driven by root pressure. Root pressure is the pressure exerted by the roots of the plant as they absorb water from the soil.

3. **Conditions for Guttation**: Guttation typically occurs when the root pressure is positive. This means that the roots are actively taking up water, leading to an accumulation of water in the plant's xylem.

4. **Analyzing the Options**:
- **Option 1**: Root pressure is positive. **(Correct)** - This is when guttation occurs.
- **Option 2**: Root pressure is negative. **(Incorrect)** - This situation does not favor guttation.
- **Option 3**: Guttation always takes place. **(Incorrect)** - Guttation does not occur under all conditions.
- **Option 4**: Guttation does not take place at all. **(Incorrect)** - This is false as guttation does occur under certain conditions.

5. **Conclusion**: The correct answer is that guttation takes place during the night when the root pressure is positive.