Turgor pressure becomes equal to the wall pressure when

Options

A. Water leaves the cell
B. No exchange of water takes place
C. Water enters the cell
D. Solute goes from the cell into water

Answer

To solve the question "Turgor pressure becomes equal to the wall pressure when," we need to understand the concepts of turgor pressure and wall pressure in plant cells.

### Step-by-Step Solution:

1. **Understanding Turgor Pressure**:
- Turgor pressure is the pressure exerted by the fluid (usually water) inside the plant cell against the cell wall. It occurs when water enters the cell, causing the protoplasm to expand and push against the rigid cell wall.

2. **Understanding Wall Pressure**:
- Wall pressure is the pressure exerted by the cell wall in response to the turgor pressure. As the cell expands due to turgor pressure, the cell wall pushes back with an equal and opposite force.

3. **Equilibrium of Pressures**:
- Turgor pressure and wall pressure are equal in magnitude but opposite in direction. This situation occurs when the cell is in a state of equilibrium, meaning that the forces are balanced.

4. **Condition for Equal Pressures**:
- Turgor pressure becomes equal to wall pressure when there is no net movement of water into or out of the cell. This typically happens when the cell is in a hypertonic environment, where the concentration of solutes outside the cell is higher than inside, preventing further water influx.

5. **Conclusion**:
- Therefore, turgor pressure becomes equal to wall pressure when there is no exchange of water taking place. This is the condition of equilibrium for the pressures involved.

### Final Answer:
Turgor pressure becomes equal to wall pressure when there is no exchange of water taking place.