Passive absorption occurs due to

Options

A. Tension in root
B. Tension is xylem sap
C. ATP
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Passive Absorption**:
- Passive absorption refers to the uptake of water and nutrients by plant roots without the expenditure of energy. This process relies on natural physical forces rather than active transport mechanisms that require energy (ATP).

2. **Identifying the Mechanism**:
- The primary mechanism behind passive absorption is the tension created in the xylem sap. This tension is generated by the process of transpiration, where water evaporates from the leaves, creating a negative pressure that pulls water upward from the roots through the xylem.

3. **Role of Tension in Xylem Sap**:
- The tension in the xylem sap creates a concentration gradient. Water moves from an area of higher concentration (in the soil) to an area of lower concentration (in the xylem), facilitating the movement of water into the roots without the need for energy input.

4. **Conclusion**:
- Therefore, passive absorption occurs due to the tension in the xylem sap. This is the correct answer to the question posed.

**Final Answer**: Passive absorption occurs due to tension in the xylem sap.

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