POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Oak xylem. Coloured scanning electron micrograph (SEM) of a section through the xylem wood vessels of an oak tree (Quercus robur). The water and mineral salts that are absorbed by the roots are conducted through the plant by these tubular cells. Xylem tissue also provides mechanical support. Magnification: x1200 at 6x7cm size.
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