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  4. Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?

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Q. Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?

AIPMTAIPMT 2005Evolution

Solution:

Prevalence of pesticide resistant insects supports natural selection theory, e.g., $DDT$ was thought to be an effective insecticide against household pests (like mosquitoes, houseflies, body lice, etc.) in $1945$. But, within $2$ to $3$ years of its introduction, new $DDT$ resistant mosquitoes appeared in the population. These mutant strains, soon became well established in the population by natural selection and thus replaced the original $DDT$ - sensitive mosquitoes