Epidermis 

• Epidermis forms one cell thick outermost layer of various body organs of plants such as leaves, flowers, stems and roots. 

• Epidermis is covered outside by cuticle. Cuticle is a water- proof layer of waxy substance called as cutin which is secreted by the epidermal cells. 

• Cuticle is very thick in xerophytes. 

• Cells of epidermis of leaves are not continuous at some places due to the presence of small pores called as stomata. 

• Each stomata is guarded by a pair of bean-shaped cells called as guard cells. These are the only epidermal cells which possess chloroplasts, the rest being colourless.