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.
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What is the correct answer to this question?
Selection of resistant forms by natural selection
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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