Ecologists studying a freshwater stream observe that algae are eaten by mayfly nymphs. Trout eat the mayfly nymphs, and otters eat the trout.
| Organism | Trophic level | Name of trophic level |
|---|---|---|
| algae | producer | |
| mayfly nymph | 2 | primary consumer |
| trout | 3 | |
| otter | 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.