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 23 - Self-Quiz - Page 387: 10


b. lichen

Work Step by Step

A lichen consists of a mutually beneficial relationship between cyanobacteria and a sac fungus. The cyanobacteria provide the fungus with food and fixed nitrogen. Fungal hyphae hold the cyanobacteria in place. The fungus provides the cyanobacteria with protection from the elements and with other nutrients needed by the cyanobacteria.
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