What is the role of `K^(+)` ions in the opening of stomata?

Explanation

### Step-by-Step Solution:

1. **Understanding Stomata**: Stomata are small openings on the surface of leaves that facilitate gas exchange and transpiration (the process of water vapor loss from the plant).

2. **Role of Guard Cells**: Each stoma is surrounded by a pair of specialized cells called guard cells. These cells control the opening and closing of the stomata.

3. **Potassium Ion Influx**: When potassium ions (K⁺) enter the guard cells, it increases the concentration of solutes within these cells. This influx of K⁺ ions is crucial for the process.

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