Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 39 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 865: 1

Answer

B.

Work Step by Step

A. and C. are wrong since they help promote growth of different parts of the plant, not responses to drought, and D. is wrong because ethylene also controls other phenomena such as aging of flower parts and root hair production.
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