Mention the role of epidermis in the following:
$(a)$ In the aerial parts of the plant.
$(b)$ In leaves.
$(c)$ In roots.

(N/A) Epidermal cells on the aerial parts of the plant often secrete a waxy,water-resistant layer on their outer surface. This layer,known as the cuticle,aids in protection against water loss,mechanical injury,and invasion by parasitic fungi.
$(b)$ The epidermis of the leaf contains small pores called stomata,which are essential for gaseous exchange (oxygen and carbon dioxide) and the process of transpiration.
$(c)$ The epidermal cells of roots possess long,hair-like extensions called root hairs. These structures significantly increase the total surface area available for the absorption of water and dissolved minerals from the soil.