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5.7 Food chains, webs and pyramids
Exam question
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Explain why a food web is more realistic than a food chain.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
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In a food web, rabbits are eaten by foxes and owls. Explain what would happen to the owl population if foxes were removed.
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Total for this question: 3 marks
5.7 Food chains, webs and pyramids
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What do arrows in a food chain show?
(1)Total for this question: 1 mark
5.7 Food chains, webs and pyramids
Exam question
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Explain why a pyramid of numbers can be inverted.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
Exam question
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Explain why pyramids of biomass are almost always pyramid shaped.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
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Describe how to draw a pyramid of biomass.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
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State one disadvantage of a pyramid of numbers.
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Total for this question: 1 mark
5.7 Food chains, webs and pyramids
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Suggest why biomass is measured as dry mass.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
Exam question
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Illustrative data.
| Trophic level | Biomass / g per m² |
|---|---|
| producer | 800 |
| primary consumer | 120 |
| secondary consumer | 15 |
| tertiary consumer | 2 |
Calculate the percentage of biomass transferred from producers to primary consumers.
(2)Total for this question: 2 marks
5.7 Food chains, webs and pyramids
Exam question
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| Trophic level | Biomass / g per m² |
|---|---|
| producer | 800 |
| primary consumer | 120 |
| secondary consumer | 15 |
| tertiary consumer | 2 |
Explain why the tertiary consumer biomass is so small.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
Exam question
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Suggest a disadvantage of measuring dry biomass.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
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In a food web, aphids are eaten by ladybirds and by small birds. Explain the effect on aphids of spraying pesticide that kills ladybirds.
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Total for this question: 3 marks
5.7 Food chains, webs and pyramids
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Compare a pyramid of numbers and a pyramid of biomass for oak tree → caterpillars → birds.
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Total for this question: 2 marks
5.7 Food chains, webs and pyramids
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Identify the organism that should be at the bottom of any pyramid.
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Total for this question: 1 mark
5.7 Food chains, webs and pyramids
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Suggest why a pyramid of energy is never inverted.
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Total for this question: 2 marks
