A food chain in a city park is:
grass → grasshopper → blackbird
An extension to a nearby building reduces the light reaching the grass, so the grass captures less light energy.
Explain how this change affects the biomass that can be supported at trophic levels 2 and 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.