Which one is against the theory of ascent of sap by Dixon and Jolly

Options

A. Pores in tracheary elements
B. Cohesion force of water molecules
C. Adhesion force of water molecules
D. Requirement of ATP

Answer

**Step-by-Step Solution:**

1. **Understanding the Theory**: The theory of ascent of sap by Dixon and Jolly is known as the Cohesion Tension Transpiration Pull Theory. It explains how water moves from the roots to the leaves of a plant.

2. **Key Components of the Theory**:
- **Continuous Column of Water**: The theory states that there is a continuous column of water from the roots through the stem to the leaves.
- **Cohesion and Adhesion**: Water molecules are held together by cohesion (the attraction between water molecules) and adhere to the walls of the xylem vessels (adhesion).

3. **Role of Cohesion and Adhesion**:
- Cohesion allows water molecules to pull each other up through the xylem.
- Adhesion helps the water column remain in contact with the xylem walls, preventing it from breaking.

4. **Transpiration Pull**: As water evaporates from the leaves (transpiration), it creates a negative pressure that pulls more water up from the roots through the xylem.

5. **Identifying the Incorrect Option**: The question asks which statement is against the theory. The requirement of ATP (adenosine triphosphate) for the ascent of sap is incorrect because the theory does not involve active transport or energy expenditure in the form of ATP. Instead, it relies on passive processes like cohesion, adhesion, and transpiration.

6. **Conclusion**: Therefore, the option that states the requirement of ATP is against the theory of ascent of sap by Dixon and Jolly.

**Final Answer**: The requirement of ATP is against the theory of ascent of sap by Dixon and Jolly.

---