When a cell is plasmolysed

Options

A. Turgor pressure becomes negative
B. Pressure potential is negative
C. Osmotic potential is negative
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding Plasmolysis**:
- Plasmolysis occurs when a plant cell loses water and the cytoplasm shrinks away from the cell wall. This typically happens when the cell is placed in a hypertonic solution, where the concentration of solutes outside the cell is higher than inside.

2. **Effects on Pressure Potential**:
- In a plasmolyzed cell, the pressure potential (also known as turgor pressure) becomes zero or negative. This is because the cell wall is no longer exerting pressure on the cytoplasm due to the lack of water.

3. **Effects on Osmotic Potential**:
- Osmotic potential refers to the potential of water to move into the cell. In a plasmolyzed state, since the cell has lost water, the osmotic potential inside the cell becomes negative. This is because the concentration of solutes inside the cell is higher compared to the outside environment.

4. **Conclusion**:
- Since both the pressure potential and osmotic potential are negative in a plasmolyzed cell, we can conclude that all the statements regarding the pressure potential, osmotic potential, and trigger pressure being negative are true.

5. **Final Answer**:
- Therefore, the correct answer is: **All of the above** (trigger pressure becomes negative, pressure potential is negative, osmotic potential is negative).