When turgidity is lost in guard cells the stomatal pore

Options

A. Remains unchanged
B. Gets plasmolysed
C. Becomes closed
D. Opens fully

Answer

**Step-by-Step Solution:**

1. **Understanding Guard Cells and Stomata:**
- Guard cells are specialized cells that surround the stomatal pore on the leaf surface. They play a crucial role in regulating the opening and closing of the stomata, which are essential for gas exchange in plants.

2. **Role of Turgidity:**
- Turgidity refers to the state of being swollen or firm due to the uptake of water. When guard cells become turgid (swollen), they cause the stomatal pore to open. This occurs because the guard cells take in water, often influenced by the influx of potassium ions and organic salts.

3. **Loss of Turgidity:**
- When guard cells lose turgidity, they become flaccid (shrunken). This loss of water can be caused by various environmental factors such as high temperatures or low humidity, leading to a decrease in water pressure within the cells.

4. **Effect on Stomatal Pore:**
- When the guard cells are flaccid, they cannot maintain the opening of the stomatal pore. As a result, the stomatal pore closes. This is a protective mechanism to prevent water loss from the plant.

5. **Conclusion:**
- Therefore, when turgidity is lost in guard cells, the stomatal pore becomes closed. The correct answer to the question is that the stomatal pore closes when guard cells lose their turgidity.

**Final Answer:**
When turgidity is lost in guard cells, the stomatal pore becomes closed.

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