GCSE Biology Unit 2 (9)

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Pyramids of Number and Biomass

  • A trophic level is a feeding level.
  • Every time you move up a stage (trophic level) in a food chain, there's less energy and less biomass.
  • There are also usually fewer organisms every time you move up a level too:
  • For example, 100 Dandelions feed 10 rabbits which feed 1 fox.
  • This is not always true though - for example, there are likely to be around 500 fleas feeding on the fox. The number has increased as you move up that stage.
  • Therefore, a better way to look at a food chain is to think about biomass instead of number of organisms.
  • You can use info about biomass…

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