Answer;
-Lipid
Step-by-step explanation;
-The plant cuticle consists of lipid and hydrocarbon polymers impregnated with wax, and is synthesized exclusively by the epidermal cells.
-The wax cuticle stops the water vapor escaping through the epidermis which is particularly important in arid deserts with little rainfall or Mediterranean climates with seasonal rainfall.
-A waxy layer known as the cuticle covers the leaves of all plant species. The cuticle reduces the rate of water loss from the leaf surface.