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 40.18 - Inquiry Question: 1

Answer

In nature, bending of living structures occurs due to differential growth, with more on the backside/outside of the curve. This suggests that the signal for light-related bending must cause more growth on the backside/less lit side of the stem or coleoptile.

Work Step by Step

Think about curves--there is more on the outside, just as your tires travel more on the outside edge when you turn your car. The signal involved in light-related bending must promote this in a stem.
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