A freshwater farm grows duckweed, a producer, in 24 large cultivation tanks.
| Production record | Value |
|---|---|
| New duckweed biomass from each tank over 12 months | 12 500 g |
| Number of tanks | 24 |
The farm manager combines the production records for all the tanks. Calculate the increase in duckweed biomass across the farm, in kilograms.
Freshwater snails feed on the duckweed. During the same 12 months, 8% of the new duckweed biomass is transferred to the snails as growth. Calculate the increase in biomass of the snails.
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.