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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 are the epidermis layers of the leaf coated in a waxy cuticle? the cuticle is the protective layer on top of the leaf & keeps the water in the leaf why are the cells of the palisades layer packed so tightly together? the light has to pass through one of them where it can be trapped why are the cells of the spongy layer acted so loosely together?