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Unformatted text preview: 1 Name ___________ PP 315 Hour Exam 2 October 18, 2007 This is a closed book exam. You have 75 minutes to complete it. Be sure to carefully answer all parts of each question. 1. Multiple choice. Highlight, bold or otherwise identify the one correct answer for each. (7 pts) 1. Plant defense mechanisms include a) avoidance b) escape c) tolerance d) oxidative bursts e) all of the above f ) a and c only 2. Characteristics of Systemic Acquired Resistance (SAR) include a) systemic protection that requires a period of time to develop but is typically long lasting b) it is induced by pathogens that cause necrosis c) protection is not passed on to seed progeny d) protection is non-specific and may have effects on many pathogens e) all of the above 3. Which of the following is not an example of a preformed resistance mechanism? a) protocatechuic acid in onion skins b) avenacins (saponins) in small grains c) toxic compounds in trichomes (leaf hairs) d) thick cuticle e) none of the above 4. Preformed chemical resistance may reduce, delay, or prevent disease by a) determining the host range of organisms b) initiating phytoalexin production c) inducing systemic resistance in Solanaceous plants d) conferring latency to certain pathogens in some tissues e) a and d only 5. Cork layers stop or slow disease by a) providing a physical barrier to pathogen b) providing a barrier to movement of pathogen enzymes and toxins out of lesion c) providing a confined area for the hypersensitive response to develop and stop disease d) all of the above e) a and b only 6. The southern corn leaf blight epidemic was important because a) it demonstrated that epidemics on low value crops like corn could not be controlled b) it illustrated the dangers of genetic uniformity in our crop plants c) it was the first epidemic known to move from the southern USA to Canada d) it demonstrated that toxin producing fungi could be both wind and rain dispersed e) all of the above 7. Outcomes of the chestnut blight epidemic included a) oaks became the dominant tree in most eastern forests previously occupied by chestnut b) it led to the passing of the Plant Quarantine Act of 1912 c) it demonstrated that bark beetles could be an important vector of plant pathogens d) it demonstrated that structural resistance can not stop an epidemic e) all of the above f ) a and b only 8. Matching: Place the correct letter by the matching number (21 points) 1. I inoculum efficiency A. illustrates pattern of inoculum movement from a source 2. __G_ aggressiveness B. strain of a pathogen that attacks only some host cultivarsB....
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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.
- Spring '08