Answer:
The protective tissue or the outermost covering of cells in plants is know as epidermis. The epidermis performs some protective function (protecting plants from some adverse conditions). It is usually made up of a single layer of cells. In dry habitats, epidermis is thicker to protect the plant from undue loss of water.
On aerial parts of plant epidermal cells often secrete a waxy, water resistant layer on their outer surface. This waxy covering aids in protecting the plant against loss of water, mechanical injury and invasion by parasitic fungi.
The cells of epidermal tissue are present in a continuous layer without intercellular spaces. (2)
Small pores are present on the epidermis of leaf.
These pores are called as stomata. They are enclosed by two kidney-shaped cells called guard cells. They help in gaseous exchange and transpiration.
As plants grow older, a strip of secondary meristem replaces the epidermis of stem. This
forms a several layer thick cork or bark of the tree. Cells are dead and compactly arranged without intercellular spaces. (2)
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