An ecologist measures the biomass at two trophic levels in an area of an urban park, as shown in the table.
| Trophic level | Biomass in g/m2 |
|---|---|
| 1 | 1500 |
| 2 | 180 |
The ecologist will use the data to draw a pyramid of biomass. The efficiency of transfer from trophic level 2 to trophic level 3 is the same as the efficiency from trophic level 1 to trophic level 2.
For the width of each bar, 1 cm represents 100 g/m2 of biomass.
Calculate the width of the bar for trophic level 3.
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.