2024 AGN115 Environmental science Practice Exam With Answers (113 Solved Questions)

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AGN 115 Exam 4| 100% Correct Answers |Verified | Latest 2024 VersionVernalization isA. is an effect of one species on another through chemicalsB. can be used to suppress the germination and growth of weedsC. the process by which many winter planted crops are converted to reproductive growthD. all of the aboveE. both a and b-✔✔C. the process by which many winter planted crops are converted to reproductivegrowthIn terms of agro-ecosystem diversity, an example of undesirable "simplification" of the system would bethe loss of predatory insects through indiscriminate use of a broad-spectrum insecticide. (Ch. 17)True or False?-✔✔TrueAlleycropping, silvopasture, buffers, windbreaks, and forest farming are all examples of agroforestryproduction systems.True or False?-✔✔TrueDung beetles are valuable for incorporating cattle waste back into the soil. Which of the followingconsiderations should be taken when applying pesticides for cattle parasites and flies to minimizedamage to dung beetle populations? (Grazing systems lecture)A. select a compound known to do less damage to the "off-target" dung beetles, such as Moxidectininstead of IvermectimB. Time the application of the pesticide so it does not coincide with dung beetle reproductionC. consider the average stock density of cattle in the field where the pesticide is being applied

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D. all of the above are important considerationsE. both A and B are important considerationsF. both B and C are important considerations-✔✔E. both A and B are important considerationsGenerally speaking, the Hessian "Fly Free" date for SW Missouri is around October 14. (Pestmanagement Lec.)True or False-✔✔TrueSelect all FALSE statements about roller-crimping a cover crop.Roller-crimping is most effective early in the morning.Roller-crimping success requires waiting one week between rolling and planting for cover crop death.Roller-crimping can potentially create residue cover of 85% or more for the growing season.Roller-crimping works by breaking the cover crop stems in multiple places, eliminating the need to usean herbicide to kill the cover crop.-✔✔Roller-crimping success requires waiting one week betweenrolling and planting for cover crop death.Living mulch is _______. (Overview of Cover Crops and Green Manures, Preston Sullivan).A. a cover crop established after harvesting the main crop and is used primarily to reduce nutrientleaching from the soil profile.B. a winter cover crop planted in late summer or fall to provide soil cover during the winter.C. a cover crop planted alongside the main crop to attract pest insects away from the main crop in orderto reduce the need for pesticide application.D. a cover crop that is interplanted with an annual or perennial cash crop-✔✔D. a cover crop that isinterplanted with an annual or perennial cash cropAccording to the assigned reading on pasture management, a surfactant is the process of using a boomtype sprayer, boom-buster nozzle, airplane, or helicopter to treat larger weed infestations with a solutionof herbicide and water.

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True or false-✔✔FalseA cover crop isthe use of plastic to cover winter vegetable crops to reduce runoff and increase soil temperatureany crop grown to provide soil cover. It can be incorporated as a "green manure".trees planted across hillsides to reduce over land flow of runoffalways incorporated into the soil-✔✔any crop grown to provide soil cover. It can be incorporated as a"green manure".The common type of tall fescue grass grown in Missouri has a fungal endophyte symbiont. The toxinproduced by the fungus can cause _______ disorders. [Select all correct answers.]"fescue foot"vernalization"summer slump"mycorrhizal associationsreproductive and milk production-✔✔"fescue foot""summer slump"reproductive and milk productionOne benefit of high density grazing is that it requires less attention and time on the part of the livestockmanager.True or False-✔✔TrueExamples of animal integration with crop systems include ______. (Ch 19)A. Agroforestry and livestock

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B. Aquaculture and crop productionC. Crop rotations that include a hay cropD. All of the aboveE. Both A and BF. Both A and C-✔✔E. Both A and BAnimals transform plant biomass into useful forms of energy and matter.True or false-✔✔TrueRotational grazing using a greater number of smaller paddocks and higher stock density result in ______than continuous grazing.A. more uniform animal waste distributionB. lower dung pat density (i.e. fewer pats per square meter)C. reduced soil microbial activityD. All of the given answers are correctE. None of the given answers are correct-✔✔A. more animal waste distributionThe total dis-integration (i.e. most farmers began specializing in either crops or livestock, rather thanproducing some of both) of livestock and crops in farming operations came about with the widespreadintroduction of specialized machinery, fertilizers, and pesticides following WWII, but specialization in USAagriculture began decades before that. (Ch. 19)True or false-✔✔trueA cover crop that is allowed to grow with the crop is called ____. (Ch. 16)-✔✔living mulchAllelopathy ____. (Cover Crop Lec.)

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A. Is an effect of one species on another through chemicalsB. Can be used to suppress the germination and growth of weedsC. Effectiveness has been observed to change with the plant's stage of growthD. All of the aboveE. Both A and B-✔✔D. All of the aboveCereal rye planted in the fall will form an allelopathic mulch by springtime only if it has undergone theprocess of vernalization.True or false-✔✔falseThe two components of species diversity are _______ and ________. (Select two) (Ch 17)A. species evennessB. taxonomic variabilityC. genetic diversityD. crop diveristyE. weed diversityF. species richness-✔✔A. species evennessF. species richnessSilvopasture is ____. (Select all correct answers.)-✔✔one form of agroforestrythe practice of planting trees as shelter for grazing livestockthe practice of grazing livestock in alleys between rowcropsOne of the clinical effects of chronic exposure to tall fescue (endophyte) toxicosis in cattle is "summerslump". The symptoms of "summer slump" include ____. (Agroforestry lecture)A. Lameness, inflammation of the coronary band, and necrosis of ears and limbsB. Hyperthermia, nervous behavior, and decreased feed consumption and milk production

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C. Diarrhea, dehydration, and dermatological infectionsD. None of the above-✔✔B. Hyperthermia, nervous behavior, and decreased feed consumption andmilk productionCover crops are often planted in mixtures of at least one grass and one legume. (Cover Crop Lec.)True or false-✔✔TrueUnwanted deciduous trees and brambles (thorny plants) in pastures can be managed by including onegoat for every 10 cows in a rotational grazing system. Keeping the goats inside the fenced area is aseparate problem. (Agrofor. Lec.)True or False-✔✔TrueIn research carried out by W. Bettiol in 1999, high concentrations of cow milk were found to be moreeffective for the control of powdery mildew in zucchini plants than conventional fungicides that theytested. (Pest Ecology Lec.)True or False-✔✔TrueIf a species is referred to as "glyphosate tolerant", that indicates that glyphosate was once effective incontrolling it but has become ineffective with time. (Lec. 13)True or false-✔✔falseTotal annual meat consumption in North America has not changed much since 1974. Total annual meatconsumption in Asia has ___ since 1974.A. decreasedB. more than tripledC. increased by about 50%

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