Chapter_26-_Plant_Responses

Chapter_26-_Plant_Responses - Chapter 26 BIO 1002 Chapter...

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Chapter 26 BIO 1002 2/21/2008 Chapter 26: Plant Responses to the Environment I. Plant Responses - Plants perceive(sense) and respond to environmental stimuli by regulating growth and development through the action of chemicals called plant hormones or growth regulators - Plants respond to: 1. Gravity (does not stop them from growing towards the light) 2. Light (still grow in darkness yet no green coloring or leaves produced) 3. Wind 4. Predators (bacteria, fungi, viruses, animals) 5. Touch - Study videos from website, one will be on exam #2: - http://plantsinmotion.bio.indiana.edu/plantmotion/starthere.html Quiz three password: flower II. Light A. Phototropism: - bending of plant towards light, 1 st plant responses studied - How does the plant bend? - Cells elongate at different rates in opposite sides of plant, causing bending - This mechanism was discovered by Peter Boysen-Jensen - Chemical produced in tips, moves down shoots causing cell to elongate - His experiment verified chemical moves down plant
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This note was uploaded on 09/22/2009 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Chapter_26-_Plant_Responses - Chapter 26 BIO 1002 Chapter...

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