What happens when a silicon emulsion is applied over the surface of leaves?

Explanation

### Step-by-Step Solution:

1. **Understanding Stomata**: Stomata are tiny openings on the surface of leaves that facilitate gas exchange and transpiration. They allow water vapor to exit the leaf and enable the intake of carbon dioxide.

2. **Application of Silicon Emulsion**: When a silicon emulsion is applied to the surface of leaves, it creates a coating over the leaf surface.

3. **Blocking Stomata**: This coating from the silicon emulsion can cover the stomata, which are the pores responsible for transpiration and gas exchange.

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