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Some bacteria survive exposure to a drug and later increase in number. This is an example of what?

Answer and explanation

Correct answer: Selection of resistant forms by natural selection

The governing concept is natural selection acting on variation. A bacterial population may contain a few cells with inherited resistance before the drug is applied. The drug kills or inhibits susceptible cells, while resistant cells survive and reproduce, causing their proportion to increase. Therefore, option B is correct. This is not definite inheritance of an acquired trait, formation of homologous organs, or sex determination.

Related tags

Bacterial ResistanceNatural SelectionHeritable VariationEvolutionHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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