The Table shows the biomass at each trophic level in a food chain in a field.
Table
| Organism | Trophic level | Biomass in g per m2\text{m}^2m2 |
|---|---|---|
| grass | producer | 1500 |
| grasshopper | primary consumer | 150 |
| frog | 12 | |
| snake | tertiary consumer | 1.2 |
Name the trophic level of the frog.
Calculate the efficiency of biomass transfer from the grass to the grasshoppers.
Use the equation: efficiency=biomass transferred to the next levelbiomass available at the previous level×100\text{efficiency} = \dfrac{\text{biomass transferred to the next level}}{\text{biomass available at the previous level}} \times 100efficiency=biomass available at the previous levelbiomass transferred to the next level×100
Give two ways biomass is lost between the grasshoppers and the frogs.
There is no fifth trophic level in this food chain.
Suggest why.
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.