AQA · Biology · 8461
GCSE Biology: Pyramids of biomass
Ecology · AQA GCSE Biology (8461), specification point 4.7.4.2. Cards are generated from the exam board's own specification for "Pyramids of biomass", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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What does a pyramid of biomass represent?
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The relative amount of biomass at each trophic level of a food chain.
In a pyramid of biomass, trophic level ? is drawn at the bottom.
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1
Which organisms occupy trophic level 1 in a pyramid of biomass?
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Producers (e.g. plants and algae), which make their own food by photosynthesis.
Why does a pyramid of biomass get narrower towards the top?
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Biomass is lost at each trophic level (e.g. through respiration and waste), so less is available to the level above.
Define biomass.
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The mass of living material in an organism or at a trophic level.
Where is the top consumer placed in a pyramid of biomass?
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At the top, as the narrowest bar — the highest trophic level.
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