Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 37 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 819: 11


Before the evolution of land plants, soil bacteria could have worked in the nitrogen cycle since entry into a plant, or any other living thing, does not have to be involved. Nitrogen can be fixed by lightning, rain down into the soil, and then proceed through the various steps until returning through the atmosphere.

Work Step by Step

The evolution of land plants simply added a lot of nitrogen to the soil when symbioses evolved between some plants and nitrogen-fixing bacteria.
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