Elder Tree Leaf Stoma (Sambucus nigra)

Elder Tree Leaf Stoma (Sambucus nigra)

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Credit: POWER AND SYRED/SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph (sem) of a stoma on an elder tree leaf (Sambucus nigra). Stomata are pores that open and close in order to regulate gas exchange in a plant. A stoma comprises a pore, the aperture of which is controlled by a pair of specialised cells known as guard cells. These cells swell to close the pore and shrink to open it. Stomata are found mainly on the underside of leaves. Magnifiction x4430 (x1090 at 10 cm wide).

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Keywords: botanical, botany, elder, elder tree, gas exchange, guard cells, leaf, leaves, open stoma, photosynthesis, plant anatomy, pore, pores, respiration, respiratory, sambucus nigra, scanning electron micrograph, scanning electron microscope, sem, stoma, stomata, transpiration

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