In a salt-marsh food chain, wading birds eat snails. The dry biomass at each trophic level is shown in the table.
| Organism | Dry biomass in kg |
|---|---|
| Snails | 300 |
| Wading birds | 24 |
Calculate the efficiency of biomass transfer from the snails to the wading birds.
Explain why less biomass is available at the wading bird trophic level than at the snail trophic level.
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.