Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
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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A long day plant is given a long night, and is interrupted by a light pulse in the middle of the night. Which quality of the light pulse will most likely prevent flowering? Select one: a. UV light b. green light c. red light d. far-red light
What is the tropic response called when a plant grows around an external object like a stake or pole? A. thigmotropism B. Gravitropism C. Phototropism
In the Philippines, owners and managers of plant nurseries have to plan lighting schedules for a long-day plant (LDP) with a critical night length of 10 hours that will flower in December. What lighting periods and color of light enrichment will be most effective for flowering of the said LDP? A. Light periods of 15 hours with light enriched in the red range of the spectrum B. Dark periods of 11 hours with light enriched in the red range of the spectrum C. Light periods of 14 hours with light enriched in the far-red range of the spectrum D. Dark periods of 9 hours with light enriched in the far-red range of the spectrum E. Light periods of 13 hours with light enriched in the red range of the spectrum F. Dark periods of 10 hours with light enriched in the far-red range of the spectrum
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