Root hairs absorb water from soil due to

Options

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

Answer

**Step-by-Step Solution:**

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

2. **Water Absorption Mechanism**: Water absorption by root hairs occurs mainly through a process called osmosis, where water moves from an area of lower solute concentration (soil) to an area of higher solute concentration (inside the root hair cells).

3. **Identifying the Pressure Types**: The question provides four types of pressures: osmotic pressure, atmospheric pressure, turgor pressure, and suction pressure. We need to identify which one is responsible for water absorption in root hairs.

4. **Analyzing Each Pressure**:
- **Osmotic Pressure**: This is the pressure required to stop the flow of water across a semipermeable membrane due to osmosis. While it plays a role in water movement, it is not the primary mechanism for root hair absorption.
- **Atmospheric Pressure**: This is the pressure exerted by the weight of the atmosphere. It does not directly influence water absorption in root hairs.
- **Turgor Pressure**: This is the pressure exerted by the fluid inside the cell against the cell wall. It helps maintain cell structure but is not the primary driver of water absorption.
- **Suction Pressure**: This is the pressure that helps draw water into the root hairs. It is created due to the higher concentration of solutes inside the root hair cells compared to the surrounding soil water.

5. **Conclusion**: The correct answer is suction pressure, as it is the mechanism that facilitates the movement of water into the root hairs due to the concentration gradient of solutes.

**Final Answer**: Root hairs absorb water from soil due to suction pressure.

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