AMI IMAGES / SCIENCE PHOTO LIBRARY AMI IMAGES / SCIENCE PHOTO LIBRARY
Plant vascular bundle. Coloured scanning electron micrograph (SEM) of a cross-section through plant tissue showing a vascular bundle. The vascular bundle is at centre, with structural (ground) tissue surrounding it. Within the vascular bundle, the larger tubes, the xylem, carry water, and the smaller tubes, the phloem, carry nutrients. Sample from a Tradescantia virginiana (spiderwort) plant.
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