A scientist measures the biomass of seagrass and the sea urchins that feed on it at four coastal sites.
Each site has 2.4 kg/m2 of seagrass biomass.
| Site | Biomass of sea urchins in g/m2\text{g/m}^2g/m2 |
|---|---|
| Site A | 18 |
| Site B | 180 |
| Site C | 195 |
| Site D | 320 |
At which site is the efficiency of biomass transfer from the seagrass to the sea urchins 7.5%?
Site A
Site C
Site B
Site D
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.