Root pressure is measured by

Options

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

Answer

To determine how root pressure is measured, we need to analyze the options provided and understand the function of each device:

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**:
- **Potometer**: This device measures the rate of transpiration in plants, not root pressure. It is also known as a transpyrometer.
- **Barometer**: This instrument measures atmospheric pressure, which is unrelated to root pressure.
- **Manometer**: This device is specifically used to measure pressure within a system, including the pressure in the roots of plants.
- **Oxanometer**: This device is used to measure plant growth and does not relate to pressure measurement.

3. **Identifying the Correct Answer**:
- Since the manometer is the only device listed that measures pressure in roots, it is the correct answer.

Thus, the correct answer to the question "Root pressure is measured by" is **C. Manometer**.