DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Sunflower stem. Light micrograph of a transverse section through the stem of a sunflower (Helianthus annuus) plant, showing a vascular bundle. The bundle contains phloem (yellow) and xylem (large blue lumen) cells, which transport carbohydrates and water around the plant respectively. Magnification: x100 when printed at 10 centimetres wide.
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