APES Chapter 13 Flashcards Answers
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which of the following is a type of subsistence agriculture?
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shifting cultivation on small plots in tropical forest
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intercropping involves growing
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several different crops on a plot of land
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all of the following are types of interplanting except
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monoculture
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riparian vegetation
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can be destroyed by trampling and overgrazing
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sustainable management of rangelands would include
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allowing no or limited grazing on riparian areas
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in most modern agriculture, which of the following effects is agriculture least likely to have on soil
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replenishment of soil fertility
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which of the following is a major environmental impact of livestock production
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water pollution
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agriculture can harm the land through
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all of these answers
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the greatest source of water pollution is
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sediment from erosion
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which of thee following sites would be expected to have the most rapid erosion rate
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construction sites
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which of the following practices leads to desertification
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all of these answers
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salt buildup may
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eventually make the land unproductive
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which of the following practices both reduces erosion and increase soil fertility
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strip cropping
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in alley cropping
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crops are planted between hedgerows of trees or shrubs that are used for fruit or fuelwood
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animal manure is normally not used as a crop fertilizer on large farms because it
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smells bad
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which of the following is false? application of animal manure
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has increased since farms have specialized in animal- or crop-farming operations
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commercially available inorganic fertilizers
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lack trace elements
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which of the following is a potential "improvement" that could be achieved by genetically modifying food plants
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tolerate more herbicides
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mandatory labeling of GMF's is required in each of the following countries except
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united states
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the country that leads the world in both meat production and consumption is
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china
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people in many European countries consume about half as much meat per person as those in united states if everyone followed the European diet, the current annual world grain harvest would support about billion people
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5
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the correct sequence for the efficiency of converting grain into animal protein for the following animals, from most efficient to least efficient is
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catfish chicken pigs beef cattle
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the worlds marine catch is not expected to increase significantly the factor least responsible for this trend is
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global warming
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fish ranching is useful for
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salmon
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fish species cultivated in aquaculture include all of the following except
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trout
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benefits of aquaculture include
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all of these answers
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aquaculture may result in
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all of these answers
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government often provide assistance to farmers because farmers have little control over
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all of these answers
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first generation pesticides include
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all of these answers
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natural pesticides come from all of the following except
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inorganic compounds
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the average homeowner in the us applies about pesticides per unit of land compared to that used by farmers
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ten times more
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according to pesticides proponents, pesticides
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all of these answers
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according to proponents of pesticides, which of the following statements are true
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all of these answers
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broad-spectrum pesticides may increase the number of a pest species through
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all of these answers
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the pesticide treadmill involves
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all of these answers
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concerns have been raised about possible links between low levels of pesticides and
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all of these answers
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which of the following is true
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all of these answers
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limits to building in resistance to pest include
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all of the above
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biological control
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is often self- perpetuating once established
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which of the following statements is a weakness of using pheromones?
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they are costly and time consuming to produce in the laboratory
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pheromones
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all of these answers
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integrated pest management than pesticides
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requires more expert knowledge about individual pest crop situations
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an integrated pest management program can
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reduce preharvest pest induced crop losses by 50%
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which of the following would not reduce the threat of pesticides in the food you eat
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use imported food whenever possible
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the sustainable agriculture philosophy would be supported by
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ecologist
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sustainable agriculture
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minimizes erosion
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sustainable agriculture
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treats long term quality of the soil as a top priority `
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sustainable agriculture
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uses local inputs as much as possible
