Force for passive water absorption develops in

Options

A. Xylem
B. Aerial parts
C. Root
D. Root hairs

Answer

### Step-by-Step Solution

1. **Understanding Passive Water Absorption**:
- Passive water absorption in plants refers to the process by which water is absorbed from the soil into the roots without the expenditure of energy. This process is driven by differences in water potential.

2. **Role of Transpiration**:
- Transpiration is the process through which water vapor is lost from the aerial parts of the plant, primarily through small openings called stomata. This loss of water creates a negative pressure (tension) in the xylem vessels.

3. **Location of Water Potential**:
- The lowest water potential in a plant occurs in the leaves due to the continuous loss of water through transpiration. This creates a gradient that facilitates the movement of water from the roots (where water potential is higher) to the leaves (where water potential is lower).

4. **Aerial Parts of the Plant**:
- The aerial parts of the plant include the stems and leaves. These parts are crucial for transpiration, which is essential for creating the necessary tension for passive water absorption.

5. **Conclusion**:
- Since the force for passive water absorption develops due to the tension created by transpiration in the aerial parts of the plant, the correct answer to the question is "aerial parts."

### Final Answer
The force for passive water absorption develops in the **aerial parts** of the plant.

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