STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Xylem plant cells. Coloured scanning electron micrograph (SEM) of a longitudinal section through a bundle of tracheid cells from a softwood toothpick. Tracheid cells transport water and mineral nutrients from the roots throughout the plant. The thick lignin cell walls also provide structural support for the stem. Magnification: x250 when printed at 10 centimetres wide.
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