Which one is a unit of measurement of water potential/osmotic pressure ?

Options

A. Watts
B. Joule
C. Pascal
D. Litre

Answer

To answer the question "Which one is a unit of measurement of water potential/osmotic pressure?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Water Potential and Osmotic Pressure**:
- Water potential and osmotic pressure are both related to the movement of water in plants and are expressed in terms of pressure.

2. **Identifying the Unit of Measurement**:
- Since both water potential and osmotic pressure are measured in terms of pressure, we need to identify the correct unit of pressure.

3. **Common Units of Pressure**:
- The common units of pressure include:
- Pascal (Pa)
- Bars
- Atmospheres (atm)
- In the context of biological systems, water potential is often expressed in bars or megapascals (MPa).

4. **Analyzing the Options**:
- The question likely provides multiple-choice options. We need to evaluate each option:
- **Watts**: This is a unit of power, not pressure.
- **Joules**: This is a unit of energy, not pressure.
- **Liters**: This is a unit of volume, not pressure.
- **Pascal**: This is a unit of pressure.

5. **Conclusion**:
- The correct unit of measurement for water potential or osmotic pressure is **Pascal (Pa)**.

### Final Answer:
The unit of measurement of water potential/osmotic pressure is **Pascal (Pa)**.

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