4. Cuticle Layer of a Plant

The cuticle layer of a plant is the hydrophobic outer layer that exists on all leaves and non-woody stems. A plant's cuticle layer acts as a shield to harmful external conditions. The structure prevents excess evaporation of water from the plant's surface and protects against contamination of the plant tissue from unsanitary water, dirt and various microorganisms. The leaves of the boxwood bush shown above have glossy cuticle layers that glare in the sun; in rainy conditions, water would bead up on the waxy cuticle surface.