Thale cress leaf stoma. Coloured scanning electron micrograph (SEM) of a stoma (round, centre) on the surface of a leaf from a thale cress (Arabidopsis thaliana) plant. Stomata are pores that are the site of gaseous exchange in the plant. The opening and closing of the stomata is controlled by semicircular guard cells (dark green), which swell and become turgid to close the openings.

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TOP11719226

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達志影像

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