The table shows the biomass at three trophic levels in a food chain.
Table
| Trophic level | Biomass in g/m2\text{g/m}^2g/m2 |
|---|---|
| Producers | 2400 |
| Primary consumers | 240 |
| Secondary consumers | 30 |
What is the efficiency of biomass transfer from the primary consumers to the secondary consumers?
1.25%1.25\%1.25%
10%10\%10%
12.5%12.5\%12.5%
87.5%87.5\%87.5%
111 exam-style questions on OCR GCSE Biology 4.1 Ecosystems, covering 4.1.1 Cycling of materials in ecosystems, 4.1.2 Microorganisms in cycling materials, 4.1.3 The carbon and water cycles, 4.1.4 Factors affecting decomposition, 4.1.5 Levels of organisation in an ecosystem, 4.1.6 Abiotic and biotic factors affecting communities, 4.1.7 Interdependence and competition, 4.1.8 Trophic levels, 4.1.9 Pyramids of biomass, and 4.1.10 Efficiency of biomass transfers. Each one has a worked solution and a mark scheme showing where the marks go.