Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 37.2, Problem 2EQ
Summary Introduction

To determine: Whether four seedling tips are enough to conclude the general response of such seedling tips in the experiments performed or not.

Introduction: An organism’s response to an external or an internal stimulus is known as its behavior. Plant movement is one of the examples of plant behavior. Chemical signals which are transported within the body of a plant are known as plant hormones. Some of the examples of plant hormones are auxins, cytokinins, gibberellins, ethylene, abscisic acid, and brassinosteroids.

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1. A) Describe the three steps (Reception, Transduction, Response) of de-etiolation (greening response) signal transduction in plants. B) Describe a signal transduction (give the stimulus and response) that may occur in humans.
Using the provided figure, describe the importance of the two phytochrome systems in controlling de-etiolation and green stem elongation under full sun and shade.  Include the key mechanisms and temporal changes in control of this process.
What is the conclusion?
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