The value of osmotic pressure becomes equal to turgor pressure when a cell is placed in a

Options

A. hypertonic solution
B. hypotonic solution
C. isotonic solution
D. both (1) and (2)

Answer

To solve the question regarding when the value of osmotic pressure becomes equal to turgor pressure in a cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Osmotic Pressure**: This is the pressure required to stop the flow of water across a semipermeable membrane due to osmosis. It is the pressure that drives water into the cell.
- **Turgor Pressure**: This is the pressure exerted by the fluid (usually water) inside the cell against the cell wall. It is the outward pressure that keeps the cell firm and turgid.

2. **Identify the Types of Solutions**:
- **Hypotonic Solution**: The concentration of solutes is lower outside the cell than inside. Water moves into the cell, increasing turgor pressure.
- **Isotonic Solution**: The concentration of solutes is equal inside and outside the cell. There is no net movement of water, and osmotic pressure equals turgor pressure.
- **Hypertonic Solution**: The concentration of solutes is higher outside the cell than inside. Water moves out of the cell, decreasing turgor pressure.

3. **Analyze the Conditions**:
- In a **hypotonic solution**, water moves into the cell, increasing turgor pressure but not equalizing it with osmotic pressure.
- In a **hypertonic solution**, water moves out of the cell, which decreases turgor pressure and does not equal osmotic pressure.
- In an **isotonic solution**, the concentrations are equal, leading to no net movement of water, which means osmotic pressure and turgor pressure balance each other out.

4. **Conclusion**:
- The value of osmotic pressure becomes equal to turgor pressure when the cell is placed in an **isotonic solution**.

### Final Answer:
The value of osmotic pressure becomes equal to turgor pressure when a cell is placed in an **isotonic solution**.

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