Campbell Biology in Focus
Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 31, Problem 5TYU
Summary Introduction

Introduction:

The stimulus that plants mostly take from the environment is photoperiod. Night length is responsible for controlling the flowering and other responses to photoperiod.

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If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering? (A) 16 hours light/8 hours dark (B) 14 hours light/10 hours dark (C) 4 hours light/8 hours dark/4 hours light/8 hours dark (D) 8 hours light/8 hours dark/light flash/8 hours dark
A decrease in the level of which hormone releases seeds from dormancy? a. abscisic acid b. cytokinin c. ethylene d. gibberellic acid
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