A solution of 1.0 M glucose develops a pressure of -27 bars in an oxmometer. What is not correct ?

Options

A. Pressure potential is -27 bars
B. Osmotic pressure in 27 bars
C. Osmotic potential is -27 bars
D. Solute potential is -27 bars

Answer

To solve the question, we need to analyze the given options based on the principles of osmotic pressure, pressure potential, and solute potential in plant biology.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Osmotic Pressure**: This is the pressure required to prevent the flow of water into a solution via osmosis. It is always a positive value.
- **Pressure Potential**: This refers to the physical pressure on a solution and is also always a positive value.
- **Solute Potential (Osmotic Potential)**: This is the potential of a solution to draw water in through osmosis and is typically negative.

2. **Analyzing the Given Information**:
- We have a 1.0 M glucose solution that develops a pressure of -27 bars in an osmometer.
- The osmometer measures osmotic potential, which is usually expressed as a negative value.

3. **Evaluating the Options**:
- **Option A**: Pressure potential is -27 bars.
- This is incorrect because pressure potential cannot be negative; it should always be positive.
- **Option B**: Osmotic pressure is 27 bars.
- This is correct because osmotic pressure is always expressed as a positive value.
- **Option C**: Osmotic pressure is -27 bars.
- This is incorrect because osmotic pressure cannot be negative.
- **Option D**: Osmotic solute potential is -27 bars.
- This is correct because solute potential can be negative.

4. **Conclusion**:
- The statement that is not correct is **Option A**: Pressure potential is -27 bars.

### Final Answer:
The incorrect statement is **Option A**: Pressure potential is -27 bars.