Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 29.1, Problem 1TYK
Summary Introduction

Introduction:

The growth of an organism in response to light stimulus is termed as phototropism. Here, the cells which are away from light have chemical auxin when phototropism occurs. The cells which are away from light become elongated cells.

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Plant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs.  a) Describe the plant’s response to the presence of light. (refer to picture)
A house plant that has been placed in the window will grow toward the source of light. Which option is the best possible reason?     auxin becomes less concentrated on the illuminated side of the plant   auxin becomes more concentrated in the roots of the plant   auxin is produced only when the sun shines   auxin inhibits the growth of cells on the shady side, so the cells on the sunny side grow faster   auxin becomes more concentrated on the illuminated side of the plant
Which of the following does auxin cause in the tropism with which it is involved? increased protein synthesis increased plasma membrane permeability hardening of cell walls cell elongation rapid cell division
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