题目内容

收藏纠错

题目材料：

Basic population biology demonstrates that widespread use of common nonspecific insecticides must inevitably exacerbate the very problems these insecticides were designed to solve because, in addition to killing "bad" insects (those that eat crops), these insecticides have a "side effect", they also kill "good" insects (those that prey on the bad insects) and indirectly reduce the good insects` birth rate. While insecticide use will decimate both populations equally, the bad insects will rebound much more quickly. In predator/prey systems, predators control the death rate of their prey by eating them, while the prey control the birth rate of their predators by providing nourishment. When population numbers of both decline, therefore, the prey`s death rate is dramatically reduced because there are many fewer predators, while the predators` birth rate is dramatically reduced because there is less food and it is harder to find. The birth rate of the prey is much less affected, and thus those insects feeding on crops are capable of rebounding first, then, in the resulting environment that is largely devoid of predators, they reach higher numbers than before.

According to the passage, one of the differences in the ways in which predator and prey insects are affected by the widespread use of common nonspecific insecticides is that

Athe populations of prey insects are restored to their former numbers faster than are the populations of predator insects
Bthe populations of prey insects decline more dramatically than those of predator insects shortly after the insecticides are used
Cthe birth rates of prey insects fall more precipitously than do the birth rates of predator insects
Dpredator insects eventually return in greater numbers than prey insects
Ethe insecticides do not kill as many prey insects as they do predator insects

A显示答案

登录后才可以添加做题笔记哦，还没有账号？马上注册

以上解析由考满分老师提供。

题目讨论

已经输入 0 个字标记为提问，会有更多小伙伴帮你解答提交

全部讨论

只看提问

按时间排序

按点赞数排序

最新提问

题目内容

题目讨论