Answer
b. photoperiod
Work Step by Step
Photoperiod refers to the relative lengths of day and night.It is the time that a plant is exposed to uninterrupted light and dark in a 24 hour period.
Campbell Biology: Concepts & Connections (9th Edition)
by Taylor, Martha R.; Simon, Eric J.; Dickey, Jean L.; Hogan, Kelly A.; Reece, Jane B.
Published by
Pearson
ISBN 10:
0-13429-601-X
ISBN 13:
978-0-13429-601-2
Chapter 33 - Review - Page 680: 12
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