Potometer works on the principle of

Options

A. osmotic pressure
B. amount of water absorbed equals to the amount transpired
C. root pressure
D. potential difference between the tip of the tube and that of the plant

Answer

### Step-by-Step Solution:

1. **Understanding Potometer**: A potometer is an instrument used to measure the rate of water absorption by a plant, which is closely related to the process of transpiration.

2. **Function of Potometer**: The potometer measures the amount of water that is absorbed by the plant and correlates it with the amount of water that is transpired (lost through evaporation from the leaves).

3. **Principle of Operation**: The potometer operates on the principle that the amount of water absorbed by the roots of the plant is equal to the amount of water that is lost through transpiration. This means that if a plant loses water through its leaves, it will absorb an equal amount of water from the soil.

4. **Elimination of Incorrect Options**:
- **Osmotic Process**: This is not the principle on which a potometer works, as it does not measure osmotic pressure.
- **Root Pressure**: Potometers do not measure root pressure; this is typically measured using a different instrument called a nanometer.
- **Potential Differences**: The potometer does not operate based on potential differences between the tip of the tube and the depth of the plant.

5. **Conclusion**: The correct principle that a potometer works on is the rate of transpiration, which is represented by the option that states the amount of water absorbed is equal to the amount of transpired.

### Final Answer:
The potometer works on the principle of the rate of transpiration, where the amount of water absorbed by the plant is equal to the amount of water transpired.