How do the guard cells regulate opening and closing of stomatal pores ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Stomata**: Stomata are small openings found on the surface of leaves and stems of plants. They play a crucial role in gas exchange (such as oxygen and carbon dioxide) and transpiration (water vapor loss).

2. **Role of Guard Cells**: Guard cells are specialized cells that surround each stomatal pore. They are typically shaped like dumbbells and are responsible for regulating the size of the stomatal opening.

3. **Opening of Stomata**:
- When water enters the guard cells from the surrounding cells, the guard cells become turgid (swollen and firm).
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