The American Heritage® Science Dictionary
Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Xylem cells in a stem carry water from a plant's roots to its leaves. Phloem distributes food that is made in the plant's leaves to other parts of the plant. Cambium cells divide into either xylem or phloem cells. The cortex and pith, seen in the stem cross section (left), provide structural support.
Xylem vessels in a leaf skeleton.Licensed from iStockPhotoSearch Images
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