STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Xylem tissue. Coloured scanning electron micrograph (SEM) of a section through xylem tissue from a dicotyledon rootlet. Xylem vessels (brown) transport water and mineral nutrients from the roots throughout the plant. It thick lignin walls also provide structural support. Surrounding the vessels are parenchyma cells.
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