Root hairs absorb water from soil due to
(a) Osmotic pressure
(b) Turgor pressure
(c) Suction pressure
(d) Root pressure

Options

A. Osmotic pressure
B. Turgor pressure
C. Suction pressure
D. Root pressure

Answer

To determine the correct answer to the question "Root hairs absorb water from soil due to," we need to analyze each option provided:

1. **Understanding the role of root hairs:**
- Root hairs are tiny extensions of root cells that increase the surface area for water and nutrient absorption from the soil.

2. **Analyzing the options:**
- **(a) Osmotic pressure:**
- Osmotic pressure refers to the pressure required to prevent the flow of water across a semipermeable membrane. In the case of root hairs, there is no semipermeable membrane involved in the direct absorption of water from the soil. Therefore, this option is not correct.

- **(b) Turgor pressure:**
- Turgor pressure is the pressure exerted by the fluid inside the cell against the cell wall. While it is important for maintaining cell structure and preventing wilting, it is not the primary mechanism for water absorption in root hairs. Thus, this option is also incorrect.

- **(c) Suction pressure:**
- Suction pressure is generated when root hairs have a higher concentration of solutes compared to the surrounding soil water. This difference in concentration creates a gradient that facilitates the movement of water into the root hairs through osmosis. This is the primary mechanism for water absorption in root hairs, making this option correct.

- **(d) Root pressure:**
- Root pressure is the pressure within the root system that helps in the upward movement of water through the plant. While it plays a role in the overall water transport within the plant, it is not directly responsible for the absorption of water by root hairs. Therefore, this option is incorrect.

3. **Conclusion:**
- The correct answer is **(c) Suction pressure**, as it is the mechanism that facilitates the absorption of water by root hairs from the soil.