Elm wood. Coloured scanning electron micrograph (SEM) of a block of wood from an elm tree (Ulmus procera). At top is a transverse section and at bottom is a longitudinal section. Xylem vessels (larger tubes) are seen in the wood. The xylem transports water and mineral nutrients from the roots throughout the plant. Its thick lignin walls also provide structural support for the stem. Magnification: x145 when printed at 10 centimetres tall.
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