Spirally thickened xylem tubes

Spirally thickened xylem tubes

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Credit: J.C. REVY, ISM/SCIENCE PHOTO LIBRARY

Caption: Xylem. Coloured scanning electron micrograph (SEM) of a longitudinal section through xylem vessels in a plant stem. Xylem tissue is responsible for the upward transport of water in the plant, from the roots into the stem and leaves. As seen here (at centre) these elongated vessels may be reinforced and strengthened with spiral bands. Alternatively, they may be perforated with several minute pores (as at lower right) which allow water to diffuse into surrounding tissue. In mature woody plants, xylem makes up the bulk of vascular tissue in the stems and branches, and is a major structural component in the plant. Magnification: x350 at 6x7cm size.

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Keywords: botany, nature, parenchyma, plant, plants, pore, pores, spiral, spiral thickened, spirally thickened, stem, vessel, xylem, xylem cells, xylem tissue, xylem vessel

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