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MMLU / Mosquitoes resistant to the pesticide DDT first appeared in India in 1959 within…

Problem

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question

Mosquitoes resistant to the pesticide DDT first appeared in India in 1959 within 15 years of widespread spraying of the insecticide. Which of the following statement best explains how the resistant mosquitoes arose?

choices

  1. Some mosquitoes experienced a mutation after being exposed to DDT that made them resistant to the insecticide. Then their population expanded because these moquitoes had no competition.
  2. Some mosquitoes were already resistant to DDT when DDT was first sprayed. Then their population expanded because all the susceptible mosquitoes had been exterminated.
  3. DDT is generally a very effective insecticide. One can only conclude that it was manufactured improperly.
  4. Although DDT is effective against a wide range of insects, it is not effective against mosquitoes.

subject

high_school_biology

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