QUIZ1-07 - A plant that is predisposed will be less able to...

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CLOSED BOOK QUIZ – 20 minutes to complete 1 Name: PP 315 – 601 Distance Section Quiz #1 – September 4, 2007 1. Define disease. L ist and define the four factors that make up the disease pyramid (3 pts). Disease – a condition that is caused by continued irritation from a primary agent that is damaging to the plant’s reproduction or growth. This condition results in symptoms. i) Pathogen – an organism that can cause disease ii) Host- something that is susceptible to a pathogen that is present iii) Host Range- plants that a specific pathogen can feed from and cause disease. iv) Parasite- an organism that gets nutrients from another living organism and lives on or inside of it. 2. a) What is predisposition? b) Is it necessary for disease to develop? c) What potential role does it play in the resistance – susceptibility continuum concept? (3 pts) Predisposition is the factors present before a pathogen is present that make the plant more susceptible to infection. It is not necessary for a disease to develop but makes it easier.
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Unformatted text preview: A plant that is predisposed will be less able to resist an infection. 3. Briefly describe 4 ways that plant diseases impact plant production and/or affect you (2 pts). When plant disease destroys crops it can cause a food shortage which means higher prices. Some diseases can make edible plants poisonous to humans. Diseases in turf can mean higher levels of chemicals being used which can contaminate the environment. Plant diseases can cause a plants aesthetic values to be decreased. 4. List the four steps in Kochs Postulates (be as complete as possible in describing each step)? What animal disease was Koch working with when he developed these rules of proof? (2 pts) 1. Establish a continual association of a diseased plant with a pathogen. 2. Separate the pathogen into a sterile culture. 3. Inoculate a plant of the same type with the pathogen and see if the disease affects it. 4. Separate the pathogen again and make sure it has not changed....
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This note was uploaded on 03/22/2008 for the course PP 315 taught by Professor Shew during the Spring '08 term at N.C. State.

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