An ecologist records feeding information for four organisms in a lake.
| Organism | Feeding information |
|---|---|
| perch | eats water fleas |
| algae | makes biomass by photosynthesis |
| pike | eats perch |
| water flea | eats algae |
Explain how the feeding information shows that the pike is at trophic level 4.
103 exam-style questions on AQA GCSE Biology 7.4 Trophic levels in an ecosystem, covering 7.4.1 Trophic levels, 7.4.2 Pyramids of biomass, and 7.4.3 Transfer of biomass. Each one has a worked solution and a mark scheme showing where the marks go.