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 2 - Application/Analysis - Page 819: 8



Work Step by Step

The key in choosing the correct answer is to see that the yellowing of the leaves has to do with a lack of chlorophyll (C.). A. is wrong since plants do not get energy from the soil, and B, can be excluded since water penetration is not necessarily related to yellowing. D. is wrong since humus decomposition does not heat plants appreciably.
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