DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Tomato root. Light micrograph of a transverse section through the centre root of a tomato (Lycopersicum esculentum) plant. Xylem cells, which transport water around the plant, are red. Outside of these are phloem cells( blue), which transport carbohydrates around the plant. The outer layer is made up of parenchyma cells. Magnification: x100 when printed at 10 centimetres wide.
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