AQA GCSE Biology contents

Unit 7 · Ecology

Trophic Levels & Pyramids of Biomass [Biology only]

2 min read · part of the full Exam Guide

Trophic levels

  • Trophic levels are the feeding positions in a food chain, numbered from the producer
Level Organisms Name
1 plants and algae that make their own food producers
2 herbivores that eat plants primary consumers
3 carnivores that eat herbivores secondary consumers
4 carnivores that eat other carnivores tertiary consumers
  • Apex predators are carnivores with no predators
  • Decomposers break down dead plant and animal matter by secreting enzymes into the environment; the small soluble molecules then diffuse into the microorganism

Full Exam Guide

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In the full topic

  • Trophic levels
  • Pyramids of biomass
  • Transfer of biomass
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