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Photoperiod red light - PowerPoint PPT Presentation

Chapter 39 Plant Responses to Internal and External Signals

Chapter 39 Plant Responses to Internal and External Signals. Plant hormones. Hormone: chemical signals that coordinate parts of an organism; produced in one part of the body and then transported to other parts of the body; low concentrations Tropism: movement toward or away from a stimulus

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Chapter 39 Plant Responses to Internal and External Signals