Question

Give reason - epidermis is thick in desert plants though it has a single layer

Answer 1

Epidermal cells on the aerial parts of the plant secrete a waxy, water-resistant layer on their outer surface. It checks the loss of water, mechanical injury and invasion by parasitic fungi. ... In desert plants, epidermis has a thick waxy coating of cutin, to check water loss.

Answer 2

Epidermis is thick in desert plants and are covered with waxy cuticle layer in order to avoid excess loss of water through transpiration due to excess heat

i hope this will help you.........