Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 28 - Self-Quiz - Page 481: 13


b. sieve tubes

Work Step by Step

Phloem is made up of two types of cells: sieve elements and companion cells. When mature, sieve elements lose most of their organelles so they are better able to conduct sugars. The metabolic functions of the sieve elements are carried out by the companion cells, which are connected to the sieve elements through openings called plasmodesmata. Sieve tubes are created by stacking sieve elements together. Sieve tubes transport sugars from regions where they are made or stored to other areas of the plant where the sugars are either stored or used by other cells.
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