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1 mark
1 markWhich 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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Selection (Cambridge O Level Biology)
Topic Questions
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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11 mark
1 markAn 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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21 mark
1 markA 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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31 mark
1 markWhen 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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