Which of the following is the most accepted theory for movement of water through plants ?

Options

A. Cohesion tension theory
B. Capillarity
C. Imbibition theory
D. Root pressure

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the most accepted theory regarding the movement of water through plants.

2. **Identifying the Theories**: There are several theories that explain the movement of water in plants, including:
- Cohesion Tension Theory
- Capillarity Theory
- Imbibition Theory
- Root Pressure Theory

3. **Evaluating the Theories**:
- **Cohesion Tension Theory**: This theory, also known as the transpiration pull theory, suggests that water moves through plants due to a negative pressure created by transpiration (the loss of water vapor from plant surfaces). It emphasizes the cohesion between water molecules and adhesion to the xylem walls.
- **Capillarity Theory**: This theory explains water movement through narrow tubes due to surface tension but does not account for long-distance transport.
- **Imbibition Theory**: This theory describes the absorption of water by solid particles, but it is not primarily focused on water movement through the plant.
- **Root Pressure Theory**: This theory suggests that water is pushed up from the roots due to positive pressure, but it cannot explain the ascent of water over long distances.

4. **Conclusion**: The most accepted theory for the movement of water through plants is the **Cohesion Tension Theory**, proposed by Dixon and Jolly in 1898. This theory effectively explains how water is transported from the roots to the leaves, primarily through the process of transpiration.

5. **Final Answer**: The correct answer is **Cohesion Tension Theory** (Option 1).

---