Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1259188132
ISBN 13: 978-1-25918-813-8

Chapter 40 - Sensory Systems in Plants - Review Questions - Synthesize - Page 830: 3

Answer

Gravitropism would always need a physical movement based on gravity which could be sensed by a cell and lead to changed growth. This could take the form of the settling of the protoplast against the cell wall on the lower side of a cell.

Work Step by Step

The key is to see that gravitropism needs a direct sensing of gravity, just as light responses must involve absorption of light. Pick anything in or about a cell which would move in response to gravity, and build you model around that. Settling of the nucleus against the cytoskeleton could also be a basis for a model.
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