Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 40 - Sensory Systems in Plants - Figure 40.4 - Data Analysis: 1

Answer

Light under a canopy is sunlight minus the light absorbed by photosynthesis, which is mostly red. This changes the ratio in favor of far-red light, all of which passes through the leaves in the canopy. This means that a phenomenon promoted by phytochome above the leaves will be inhibited below based on the changed ratio.

Work Step by Step

Review past material on photosynthesis to see where the red light goes as light moves through a canopy. Then, simply apply this to the normal roles of phytochrome discussed in this chapter.
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