Absorption of water by root hairs is an example for

Options

A. Passive transport of water
B. Energy is not utilised
C. Special type of diffusion of solvents
D. All the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the mechanism through which water is absorbed by root hairs in plants.

2. **Identifying the Options**: The options provided are:
- A) Passive transport of water
- B) Energy is not utilized
- C) Special type of diffusion solvents
- D) All of the above

3. **Analyzing Passive Transport**: Passive transport refers to the movement of substances across a cell membrane without the use of energy. In the case of root hairs, water moves from an area of higher concentration in the soil to an area of lower concentration in the root cells.

4. **Role of Osmosis**: The absorption of water by root hairs is primarily due to osmosis, which is a type of passive transport. Water moves through the semi-permeable membranes of root hairs due to osmotic gradients created by the concentration of solutes inside the root cells.

5. **Transpiration's Influence**: The process of transpiration (the loss of water vapor from the aerial parts of the plant) creates a negative pressure that helps pull water upward from the roots through the xylem. This process also contributes to the osmotic gradient that facilitates water absorption.

6. **Conclusion**: Given that the absorption of water by root hairs does not require energy and occurs through passive transport mechanisms (osmosis), the correct answer is:
- **Option A: Passive transport of water**.