Pressure potential in a plasmolysed cell is

Options

A. Positive
B. Zero
C. Negative
D. Remains same

Answer

### Step-by-Step Solution

1. **Understanding Pressure Potential**:
- Pressure potential is the hydrostatic pressure exerted by the fluid (water) inside the cell against the cell wall. It is a key component in maintaining turgidity in plant cells.

2. **Characteristics of a Plasmolyzed Cell**:
- A plasmolyzed cell is one that has lost water and has become flaccid. This occurs when the cell is placed in a hypertonic solution, causing water to exit the cell.

3. **Pressure Potential in Turgid vs. Plasmolyzed Cells**:
- In a turgid cell (full of water), the pressure potential is positive because the cell is exerting pressure against the cell wall.
- In a plasmolyzed cell, however, there is no water entering the cell, and the cell does not exert any pressure against the cell wall.

4. **Conclusion on Pressure Potential in Plasmolyzed Cells**:
- Since a plasmolyzed cell is flaccid and lacks internal pressure from water, the pressure potential in a plasmolyzed cell is zero.

5. **Final Answer**:
- Therefore, the correct answer to the question is that the pressure potential in a plasmolyzed cell is **zero**.