What is the role of epidermis in plants?

Explanation

### Step-by-Step Solution:

1. **Definition of Epidermis**: The epidermis is the outermost layer of cells in a plant. It serves as a protective barrier for the plant's internal structures.

2. **Protection**: The primary role of the epidermis is to protect the plant from physical damage, pathogens, and environmental factors. It acts as the first line of defense against harmful elements.

3. **Waxy Cuticle Formation**: In the aerial parts of the plant (such as leaves and stems), the epidermal cells secrete a waxy substance known as cutin. This forms a protective layer called the cuticle.

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