Wilting occurs in plants because of

Options

A. endosmosis
B. exosmosis
C. imbibition
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Wilting**:
- Wilting is a condition in plants where they lose their rigidity and appear droopy or limp. This happens when the plant cells lose water.

2. **Role of Transpiration**:
- Transpiration is the process through which water evaporates from the plant's surface, primarily through small openings called stomata. When transpiration occurs, water is lost from the plant.

3. **Water Absorption vs. Water Loss**:
- For a plant to maintain its turgor pressure (the pressure of the cell contents against the cell wall), it must absorb water through its roots. If the rate of water loss through transpiration exceeds the rate of water absorption, the plant will begin to wilt.

4. **Exosmosis**:
- The process of exosmosis refers to the movement of water out of the plant cells. When the surrounding environment has a lower concentration of solutes than the inside of the cell, water moves out of the cell, leading to a decrease in turgor pressure.

5. **Consequences of Wilting**:
- As water continues to be lost and not replaced, the cells lose their turgor pressure, leading to wilting. This is particularly noticeable in non-woody parts of the plant, where the loss of water causes a significant decrease in rigidity.

6. **Conclusion**:
- Therefore, wilting occurs in plants primarily due to the loss of water through transpiration, which is greater than the water absorbed by the roots, leading to exosmosis and a decrease in turgor pressure.

### Final Answer:
Wilting occurs in plants because of the loss of water through transpiration, which exceeds the water absorbed by the roots, leading to exosmosis and a decrease in turgor pressure.