Env Science (97% in the course

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Environmental Sciences
ENVS 1126
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Environmental Science 11e WrightChapter 4 Populations and Communities1 Golden frog populations would be more likely to survive the current threats ifA their populations were more widely distributed across Central and South AmericaB their populations were smaller in sizeC individuals were very similar to each otherD they only fed on a single type of foodAnswerADiff 3Topic4Introduction2 A group of frogs in a rain forest represents a population if the frogsA live in the same region and can potentially reproduce with each otherB look similar to each other and seem to be well adapted to the same regionC are preyed upon by the same group of predators and seem to be camouflagedD live in the same region and feed on about the same types of foodAnswerADiff 2Topic413 Along the shoreline of a pond Canadian geese American toads and Grass frogs search for food while bluegill and bass prey on small fish in the shallow water These species living and feeding in this particular location represent oneA speciesB populationC communityD ecosystemAnswerCDiff 2Topic414 A population would be expected to grow ifA immigration increased and deaths and emigration decreasedB immigration and emigration increased by the same number of organismsC emigration and death rates stayed the same and immigration decreasedD births decreased by 1 and emigration increased by 8AnswerADiff 2Topic411Copyright2011PearsonEducationInc5 A stable population would remain stable ifA the birth rate increased as the death rate decreasedB emigration rates and death rates increased equallyC births and immigration increased by the same number of organismsD births and deaths increased by the same number of organismsAnswerDDiff 3Topic416 A population that is at equilibrium isA experiencing a slow rate of growthB staying at about the same sizeC slowly losing size because of increases in environmental resistanceD has most likely just lost a key predatorAnswerBDiff 1Topic41In North America a toxic weed called leafy spurge was accidentally introduced and has grown and spread rapidly covering millions of acres in north central United States and south central Canada Leafy spurge is generally avoided by cattle and horses and may be toxic to them Thus rangeland where leafy spurge has spread has been damaged by the invasion of this plantThe following questions address these leafy spurge populations7 Plants such as leafy spurge can double their population size every year in part because of their efficient production of large amounts of seeds Populations that can double every year such as leafy spurgeA can do so endlessly eventually covering all of the land on EarthB exhibit constant growth increasing by the same amount every yearC exhibit a state of equilibrium when they are spreadingD exhibit exponential growth as they spread to new regionsAnswerDDiff 2Topic418 Leafy spurge has spread completely across many US states If left uncontrolled in these states leafy spurge populations willA keep growing indefinitelyB reach their carrying capacityC shift from a Jcurve to a constant rate of growthD shift from an Sshaped curve to a Jshaped growth curveAnswerBDiff 2Topic412Copyright2011PearsonEducationInc
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