Yew stoma SEM

Yew stoma SEM

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Credit: EYE OF SCIENCE/SCIENCE PHOTO LIBRARY

Caption: Yew stoma. Coloured scanning electron micrograph (SEM) of a stoma (hole) on the surface of the leaf of an English yew (Taxus baccata). A stoma is an opening which regulates gas and water exchange between the leaf and the atmosphere. During the day its opens to allow the exchange of gases during photosynthesis, closing at night to prevent water loss. It is opened and closed by two bordering guard cells (brown, inside stoma) below this top layer. This yew is a long-lived poisonous tree which inhabits cool, hilly areas throughout Europe and northern Asia. Magnification: x1300 at 6x7cm size. x2000 at 4x5"

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Keywords: botany, english yew, gaseous exchange, guard cells, leaf, leaves, nature, plant, plants, scanning electron micrograph, sem, stomata, taxus baccata, water regulation

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