Question

What are Guard Cells and Epidermal tissue?

Answer 1

A guard cell is an epidermal cell that can open the stomata to take in or release oxygen, carbon dioxide and water, consequently enabling these molecules to travel through the stomata. Guard cells are shaped like kidneys or sausages and the walls normally vary in rigidity.


Epidermis, in botany, outermost, protoderm-derived layer of cells covering the stem, root, leaf, flower, fruit, and seed parts of a plant. The epidermis and its waxy cuticle provide a protective barrier against mechanical injury, water loss, and infection.

Answer 2

A gaurd cell is a epidermal cell that can open the stomata to to take in or to relese the oxygen carbondioxide and water.They can enable these molecules to pass through stomata.They are almost shaped like kidneys.
Epidermal tissues
"epidermal tissues protects the internal tissues and reduces the rate of transpiration.The epidermal tissue helps the gaseous exchange due to presence of stomata."
Hope it helps