Whose water potential is less then water potential of root hair during water absorption (by root hair)

Options

A. Gravtiational water
B. Pure water
C. Vacuolar sap
D. Soil solution

Answer

To solve the question "Whose water potential is less than the water potential of root hair during water absorption (by root hair)?", we will analyze the options provided and understand the concept of water potential.

### Step-by-Step Solution:

1. **Understand Water Potential**: Water potential (Ψ) is defined as the potential energy of water in a solution compared to pure water. It is a measure of the tendency of water to move from one area to another, primarily through osmosis.

2. **Identify Water Potential Values**:
- Pure water has the highest water potential, which is considered to be 0 (zero).
- When solutes are added to water, the water potential becomes negative. The more solute present, the more negative the water potential.
- In plants, the water potential of root hairs is typically between -1 to -2 atmospheres (or bars).

3. **Analyze the Options**:
- **Gravitational Water**: This has a higher water potential than root hair because it is water that is available for plants and is not bound by solutes.
- **Pure Water**: This has the highest water potential (0), which is greater than that of root hairs.
- **Soil Solution**: The water potential of soil solutions can range from -3 to -4 atmospheres, which is lower than that of root hairs.
- **Vacuolar Sap**: This has a very low water potential, often more negative than that of root hairs, making it a region where water tends to move towards.

4. **Determine the Correct Answer**:
- Among the options, the vacuolar sap has a lower water potential than the water potential of root hairs. Thus, it is the correct answer to the question.

### Conclusion:
The correct answer is **Vacuolar Sap**, as it has a water potential that is less than that of root hairs during water absorption.

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