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no gas exchange happen during night as stomata close

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What is a stoma?

A stoma which is a singular form of stomata is a plant cell structure in the epidermis of tree leaves and needles that help plants exchange carbon dioxide and water with the atmosphere.

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•stomata =pores in a leaf,mostly on the undersurface
•each pore is surrounded by a pair of guard cells
•guard cells can change shape to open or close the stoma

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open stoma : turgid guard cell
closed stoma : flaccid guard cell

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Carbon dioxide is diffused into the leaves during stomata opening.

Water and oxygen are diffused out of the leaves during stomata closing.

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Stomata are tiny openings or pores found in the epidermis of leaves and young stems that helps in gas exchange.pair of specialized bean-shape cells called guard cells are found to surround each stoma

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the guard cells usually kidney-shaped,
pore connect the internal atmosphere of the leaf with the surrounding,cells guard contain chloroplast,the walls of the guard cells enclosed the pore are strengthrnedby cellulose microfibrils,no gas exchange happen during night as stomata close,loss of turgidity in guard cells when stomata being open

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stomata open during the day while stomata close during night

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The leaf's underside has more stomata than the leaf's surface!