Define stomata.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Stomata**: Stomata are small openings or tiny pores found on the surfaces of plant leaves and stems.

2. **Function of Stomata**: These openings play a crucial role in the process of transportation within plants, particularly in gas exchange and transpiration.

3. **Guard Cells**: Stomata are surrounded by specialized cells known as guard cells. These cells are typically kidney-shaped and are responsible for regulating the opening and closing of the stomata.

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