Endosmosis of water occurs when water potenial of the cell sap is

Options

A. Higher
B. Equal
C. Lower
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Osmosis**: Begin by defining osmosis. Osmosis is the movement of water molecules through a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

2. **Differentiate Between Endosmosis and Exosmosis**:
- **Endosmosis** refers to the movement of water into the cell, which occurs when the water potential of the cell sap is lower than that of the surrounding solution.
- **Exosmosis** is the movement of water out of the cell, which occurs when the water potential of the cell sap is higher than that of the surrounding solution.

3. **Analyzing Water Potential**: Water potential is a measure of the potential energy in water and is influenced by solute concentration and pressure.
- When the water potential of the cell sap is **high**, water moves out of the cell (exosmosis).
- When the water potential of the cell sap is **equal** to the surrounding solution, there is no net movement of water (no osmosis).
- When the water potential of the cell sap is **low**, water moves into the cell (endosmosis).

4. **Conclusion**: Therefore, endosmosis of water occurs when the water potential of the cell sap is **lower** than that of the surrounding solution. This results in water moving into the cell, causing it to swell and become turgid.

5. **Final Answer**: The correct option is that endosmosis of water occurs when the water potential of the cell sap is **lower**.

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