Feeding relationships in the open ocean can be organised into trophic levels. The table summarises one food chain.
| Organism | Trophic level | Name of trophic level |
|---|---|---|
| phytoplankton | 1 | |
| zooplankton | primary consumer | |
| herring | 3 | |
| tuna | 4 | tertiary consumer |
Complete the table.
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.