What is the role of epidermis in plants?

The epidermis serves as the outermost protective layer of plants, forming a barrier against water loss, mechanical injury, pathogen invasion, and environmental stress. Typically consisting of a single layer of tightly packed cells, the epidermis is often covered by a waxy cuticle that minimizes water evaporation. It contains specialized structures like stomata (for gas exchange), trichomes (hair-like structures for protection), and root hairs (for absorption). The epidermis essentially acts as the plant's skin, regulating interactions with the external environment while maintaining internal homeostasis.