BIO 1002 Chapter 26 Plant Responses

BIO 1002 Chapter 26 Plant Responses - Chapter 26: Plant...

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Chapter 26: Plant Responses to the Environment Plants perceive and respond to environmental stimuli by regulating growth and development through the action of chemicals called plant hormones or growth regulators. Plants can senses changes in their environment and adjust themselves. A. Plants respond to: 1. Gravity a. Roots grown down if you turn a plant on it’s side 2. Light a. Circadian rhythm: senses light and moves toward where the sun is facing using plant hormones 3. Wind 4. Predators(bacteria, fungi, viruses, animals) 5. Touch B. How does the plant bend? 1. *Phototropism: bending of plant toward light, 1 st plant response studies 2. Cells elongate at different rates on opposite sides of plant, causing bending (the dark side is where the growth occurs); Charles Darwin was the first to observe this and record it in writing 3. Mechanism discovered by Peter Boysen-Jensem a. Chemical produced in the tips that moves down causing cell elongation 1)
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This note was uploaded on 10/16/2008 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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BIO 1002 Chapter 26 Plant Responses - Chapter 26: Plant...

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