It has been observed that when a pesticide is repeatedly used over a period of several years it gradually loses its effectiveness in killing pest species. What is the best explanation for this?

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    The genetically resistant members of the pest species survive and reproduce a population that is more resistant to the pesticide.
     Any chemical loses its potency after a time due to the breakdown of chemical molecules.
     Pesticide manufacturers tend to make it more and more diluted so as to maximize their profits.
     The insects gradually become immune to the effects of the poison, just as humans become immune by vaccination against a disease.
asked Jun 25, 2012 in Environmental Science by anonymous
    

1 Answer

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The genetically resistant members of the pest species survive and reproduce a population that is more resistant to the pesticide.
answered Jun 26, 2012 by Geodude ~Top Expert~ (9,680 points)

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