Select an correct statement for osmotic potential

Options

A. Osmotic pressure is the positive pressure applied
B. Osmotic potential is negative
C. Numerically osmotic pressure is equivalent to the osmotic potential, but the sign is opposite.
D. All are correct

Answer

To solve the question regarding osmotic potential, we need to analyze the statements provided and understand the concepts of osmotic pressure and osmotic potential.

### Step-by-Step Solution:

1. **Understanding Osmotic Potential**:
- Osmotic potential refers to the potential of water to move from an area of lower solute concentration (hypotonic) to an area of higher solute concentration (hypertonic) through a semi-permeable membrane.
- It is typically expressed as a negative value because it represents the tendency of water to move into a solution.

2. **Understanding Osmotic Pressure**:
- Osmotic pressure is the minimum pressure required to prevent the flow of water into a solution via osmosis.
- This pressure is positive because it counteracts the osmotic movement of water.

3. **Relationship between Osmotic Pressure and Osmotic Potential**:
- Osmotic pressure and osmotic potential are numerically equal but have opposite signs. This means if osmotic pressure is +π, then osmotic potential (Ψs) is -π.

4. **Analyzing the Options**:
- **Option 1**: Osmotic pressure is a positive pressure. (Correct)
- **Option 2**: Osmotic potential is a negative pressure. (Correct)
- **Option 3**: Numerically osmotic pressure is equivalent to osmotic potential, but the sign is opposite. (Correct)
- **Option 4**: All are correct. (Correct)

5. **Conclusion**:
- Since all the statements regarding osmotic pressure and osmotic potential are correct, the correct answer to the question is: **All are correct**.