Question

define epidermis
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Answer 1

Epidermis

Epi :- upon ; derma :- skin.

$\bigstar$ Epidermis is the outermost layer of the primary plants that has direct contact with external environment.

$\bigstar$ They are made up of enlongated, compactly packed cells without any intercellular spaces.

$\bigstar$ The cells have large central vacuole surrounding by protoplasm.

$\bigstar$ Epidermis is generally single layered and sometimes multi layered in aerial roots.

$\bigstar$ In epidermis the outer wall is thick and they are usually covered by a cuticle. Cuticle prevents the loss of water.

$\bigstar$ Some epidermal cells of certain monocots are comparatively large and thin walled . These cells store water and help in closing and opening of leaves without breaking (due to changes in turgidity).