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O LevelBiologyCambridgeExam Questions17. Inheritance17.4 Selection

Selection (Cambridge O Level Biology)

Exam Questions

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17.4 Selection

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17.4 Selection

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1
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Which of the following is not a feature of natural selection?

  • Production of many offspring

  • Selection by humans

  • Competition for resources

  • Variation in the population

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1
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An island’s entire population of a species of butterfly is descended from just two parents. These were introduced from the mainland.

Which of the following statements about this butterfly population, compared with that of the mainland, is correct?

  • The population shows more genetic variation

  • The population will adapt more slowly to environmental changes

  • The population shows more phenotypic variation

  • The population is in less danger of dying out due to disease

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2
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A patient with a bacterial infection is treated with antibiotics, but some of the bacteria survive.

Which statement about the surviving bacteria is correct?

  • The bacteria will now be resistant to all antibiotics

  • The resistant bacteria are the result of selective breeding

  • Natural selection is acting on the bacteria

  • The antibiotic will now be more effective when it is used to treat the next generation of bacteria

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3
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When growing millet, farmers choose seeds from high-yielding plants.

What is this an example of?

  • Evolution

  • Adaptation

  • Artificial selection

  • Natural selection

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41 mark

Which statements about natural selection are correct?

  natural selection can lead to better-adapted species surviving natural selection can lead to the extinction of a species natural selection can lead to gene mutations occurring
A true true true
B true true false
C true false true
D false true true

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    11 mark

    Which feature of a cereal crop cannot be improved by selective breeding alone? 

    • ability to fix nitrogen

    • resistance to drought

    • tolerance to low temperatures

    • number of seeds produced

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