In root hair, water enters due to

Options

A. Diffusion
B. W.P.
C. T.P.
D. O.P.

Answer

**Step-by-Step Solution:**

1. **Understanding Root Hair Structure**: The root hair is a specialized extension of root cells that increases the surface area for water and nutrient absorption from the soil.

2. **Water in Soil**: The soil surrounding the root hair contains water mixed with minerals. This water is not pure; it has a concentration of solutes (minerals) that affects the movement of water.

3. **Concentration Gradient**: The presence of minerals in the soil creates a concentration gradient. The concentration of solutes in the soil water is higher than that inside the root hair cells. This difference in concentration creates a negative water potential gradient.

4. **Osmosis**: Water moves from an area of higher water potential (soil) to an area of lower water potential (inside the root hair) through a semi-permeable membrane. This movement of water is specifically termed osmosis.

5. **Osmotic Pressure Generation**: As water enters the root hair, it generates osmotic pressure. Osmotic pressure is the pressure required to prevent the flow of water across a semi-permeable membrane. It is a crucial factor in the uptake of water by root hairs.

6. **Conclusion**: Therefore, the primary reason water enters the root hair is due to osmotic pressure created by the difference in solute concentration between the soil water and the fluid inside the root hair cells.

**Final Answer**: Water enters the root hair due to osmotic pressure.

---