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The dermal layer consists of two parts. The epidermis is a one-cell thick, skinlike tissue that covers the entire plant. In woody plants, this tissue is stiffer and more corky. The epidermis secretes a waxy substance that coats the outside of the leaf, the cuticle. Tiny openings, called stomata, dot the surface of the leaf. The stomata open and close to release water and gasses from the plant.
Why is the waxy cuticle on a leaf? The waxy cuticle prevents the excessive transpiration from the leaves. However, the transpiration, a term for water evaporation from plants, can still occur through stomata. Wâ¦ithout cuticle layer, the water will evaporates through the epidermis much more easily.   The transpiration itself is an important factor that drives the water movement inside a plant. As a water in a leaf evaporates, the empty space left in the leaf will pull the water molecules from roots and stem.