Epidermis is the skin....protection is its primary function
The function of the epidermis in the stem is to protect the underlying tissues.
"As you recall, epidermis (1) is the outermost cell layer of leaves, roots and stems. Unlike the root epidermis, stem and leaf epidermis contain stomata (more on stomata when we discuss photosynthesis). In many plants, leaf and stem epidermis is covered by a wax-like layer of cutin, which protects the plants from excessive water loss, and from pathogen attack."
upper epidermis for sure>>>
protection
Root cap epidermis's function is protection while that of root hair is absorption .
plants and flowers
Coastal plants have plenty of water to absorb and transpire therefore their epidermis does not require water conservation; on the other hand non coastal plants have to conserve water hence their epidermis is thick.
The structure in the epidermis that gaseous exchange occurs in plants is through the stomata. A stomata is a tiny opening or pore in the epidermis.
Also known as dermatogen, protoderm is the outermost layer of meristem found in embryonic plants. Eventually, the protoderm matures into the epidermis as the plant grows.
Epidermis in roots: The epidermis in the roots of a plant is the outside layer of a root. It's function is to protect the root.Epidermis in leaves: There is an upper and lower epidermis in the leaves.
Plants do not have an edpidermis because the epidermis is a layer of skin found only on animals.