Answer
Response of a plant towards a stimulus is called tropism. Stems exhibit phototropism as they respond towards the stimulus of light. Roots exhibit gravitropism as they respond towards the stimulus of gravity.
Work Step by Step
As above
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 24, Plant Reproduction and Response - Assessment - 24.3 Plant Hormones - Understand Key Concepts/Think Critically - Page 723: 19
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