Answer the following question given this paragraph: 

The epidermis of the leaf consists of a single layer of tightly-packed dermal cells. They secrete waxy cuticle to prevent evaporation of water from the leaf. The epidermis has tiny pores called stomata (singular, stoma) that control transpiration and gas exchange with the air. Figure below explains how stomata carry out this vital function.


Q: The epidermis of the leaf consists of a single layer of which cells?


A:
dermal cells