Campbell Biology: Concepts & Connections (9th Edition)

Published by Pearson
ISBN 10: 0-13429-601-X
ISBN 13: 978-0-13429-601-2

Chapter 33 - Review - Page 680: 10

Answer

d. Circadian rhythm.

Work Step by Step

Circadian rhythm in plants is a biological time cycle of about 24 hours. Plants too have separate times to function and sleep. But they do not need environmental cues like sunrise and sunset to function and sleep. This biological cycle which needs no cues from the outside is called circadian rhythm.
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