DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Squash root. Light micrograph of a transverse section through a squash (Cucubita sp.) root. The large vessels (red) are xylem cells, which transport water. Parenchyma tissue is blue. At the outer ends of the xylem tissue are groups of phloem cells that transport carbohydrates around the plant. The outer layer is cork cambium (brown). Magnification: x45 when printed at 10 centimetres wide.
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