Root pressure can be measured by the instrument

Options

A. Potometer
B. Auxenometer
C. Manometer
D. Barometer

Answer

To answer the question "Root pressure can be measured by the instrument," we will analyze the options provided and determine which instrument is appropriate for measuring root pressure.

### Step-by-Step Solution:

1. **Understanding Root Pressure**:
- Root pressure is the pressure exerted in the roots of plants, which helps in the upward movement of water and nutrients through the xylem.

2. **Analyzing the Options**:
- **Option 1: Potometer**
- A potometer is primarily used to measure the rate of transpiration in plants, not root pressure. Therefore, this option is incorrect.

- **Option 2: Auxinometer**
- An auxinometer is used to measure the growth response of plants to auxins (plant hormones) and is not designed for measuring root pressure. Thus, this option is also incorrect.

- **Option 3: Manometer**
- A manometer is an instrument used to measure pressure. It can be used to measure root pressure in plants, making this option correct.

- **Option 4: Barometer**
- A barometer measures atmospheric pressure and is not related to measuring root pressure. Therefore, this option is incorrect.

3. **Conclusion**:
- After evaluating all the options, the correct instrument for measuring root pressure is the **manometer**.

### Final Answer:
Root pressure can be measured by the instrument **manometer** (Option 3).

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