Xylem vessel

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Xylem is the water transporter cells of plants. Xylem is composed of xylem vessels, xylem tracheids, xylem fibres and xylem parenchyma. Xylem vessels comprised a vertical chain of lengthened, dead cells known as vessel elements. The cells are arranged end to end and the cross-walls dissolve completely or have simple or complex perforation plates between successive cells. The secondary walls of vessels are impregnated with lignin and are thickened unevenly. The walls of the vessels may be thickened in different ways, e.g. annular, spiral and pitted thickening may be observed.

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