Table shows the biomass at each trophic level in a lake.
Table
| Trophic level | Biomass in g/m2 |
|---|---|
| Producers | 12 000 |
| Primary consumers | 1 500 |
| Secondary consumers | 120 |
| Tertiary consumers | 18 |
What is the efficiency of biomass transfer from the primary consumers to the secondary consumers?
1%
8%
12.5%
15%
61 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.