FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Plant stomata. Artwork of a section through a leaf showing a stoma.Stomata are pores in the epidermis of the leaf and the site of gaseous exchange in the plant. The opening and closing of the stomata is controlled by semi-circular guard cells. When the guard cells are turgid the stomata are open and when they are flaccid the stomata are closed.
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