Why guard cells are important?

Explanation

### Step-by-Step Solution:

1. **Location of Guard Cells**: Guard cells are located on the surface of leaves, specifically surrounding the stomata.

2. **Function of Stomata**: Stomata are small openings that facilitate the exchange of gases (like carbon dioxide and oxygen) between the plant and the atmosphere.

3. **Role of Guard Cells**: Guard cells control the opening and closing of the stomata. They act as gatekeepers, regulating the entry and exit of gases and water vapor.

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