NIGEL CATTLIN, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY NIGEL CATTLIN, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY
Celery stem vascular bundles. Cross-section through a stem from a celery plant (Apium graveolens), showing how dye (orange) was taken up through the vascular bundles after the stem was placed into a coloured solution. Vascular bundles are structures in plants containing the tissues responsible for transporting water and nutrients.
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