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该题平均耗时:2m54s,平均正确率:49.7% 添加做题笔记

More selective than most chemical pesticides in that they ordinarily destroy only unwanted species, biocontrol. agents (such as insects, fungi, and viruses) eat, infect, or parasitize targeted plant or animal pests. However, biocontrol agents can negatively affect nontarget species by, for example, competing with them for resources: a biocontrol agent might reduce the benefits conferred by a desirable animal species by consuming a plant on which the animal prefers to lay its eggs. Another example of indirect negative consequences occurred in England when a virus introduced to control rabbits reduced the amount of open ground (because large rabbit populations reduce the ground cover), in turn reducing underground ant nests and triggering the extinction of a blue butterfly that had depended on the nests to shelter its offspring. The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them: most organisms likely to be adversely affected by indirect interactions are of little or no known commercial value and the events linking a biocontrol agent with an adverse effect are often unclear. Moreover, determining the potential risks of biocontrol agents before they are used is difficult, especially when a nonnative agent is introduced, because, unlike a chemical pesticide, a biocontrol agent may adapt in unpredictable ways, so that it can feed on or otherwise harm new hosts.

Which of the following is mentioned in the passage as an indirect effect of using a biocontrol agent?


  • 分析A选项
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  • 分析B选项
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  • 分析C选项
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  • 分析D选项
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  • 分析E选项
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当前版本由 bella 更新于2016-01-04 15:30:30 感谢由 bella 对此题目的解答所做出的贡献。

第二段开头讲indirect consequences,讲的是想控制兔子数量所以引入一种病毒,却减少了其他物种的数量,还害一种蓝蝴蝶灭绝了。选d


a减少市场价值,不对

b非计划性繁殖,不对

c目标物种的突变不对

e与最大物种的资源竞争,不对


题目讨论 3条评论)

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  • 用户头像
    Mariposa爱学习

    E largest species完全未提及, 怎么能选呢???
    0 0 回复 2021-02-22 18:49:07
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    阿婉会有720

    B选项 proliferation 增殖
    0 0 回复 2017-08-26 09:12:37
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    OoO

    定位到However, biocontrol agents can negatively affect nontarget species by, for example, competing with them for resources: a biocontrol agent might reduce the benefits conferred by a desirable animal species by consuming a plant on which the animal prefers to lay its eggs. Another example of indirect negative consequences   E 是 biocontrol agent might reduce the benefits conferred by a desirable animal species 的同义替换
    0 0 回复 2016-11-05 21:02:19
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