Structures that help plants prevent disease are&colon; cuticular layer, cell walls and stomata guard cells. The cephalic region is covered by transverse rows of cuticular spines. In insects, cuticular polyphenol oxidases are present and their products are responsible for desiccation tolerance. Insect body surface is coated with cuticular hydrocarbons (CHC) for waterproofing. Nonacosene comprised 34% of cuticular lipids in the queen. The outermost is a smooth and undifferentiated layer called cuticular mantle. The level of mortality increases with differences in the composition of cuticular hydrocarbons between colonies. Kin recognition occurs because each species has a unique cuticular hydrocarbon composition. Also, minor differences occur between the cuticular hydrocarbon compositions of workers and queens. It appears that the symbiotic bacteria changed the levels of cuticular hydrocarbon sex pheromones. Differences in cuticular hydrocarbons are detected by other ant species, who respond accordingly. Chemical components are also present in the form of cuticular hydrocarbons. The butterfly releases cuticular hydrocarbons (CHCs) that mimic the CHCs of the host male ant. A large number of surface cuticular ridges (synlophe) are perpendicular to the surface. Spores first adhere to the cuticular layer on leaves and stems of host plant.