Campbell Biology (11th Edition)

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

Chapter 39 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 869: 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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