Practise AQA GCSE Biology 7.4 Trophic levels in an ecosystem with exam-style questions for Foundation and Higher tier. 21 questions covering 7.4.1 Trophic levels, 7.4.2 Pyramids of biomass, and 7.4.3 Transfer of biomass, matched to the AQA GCSE Biology (8461) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.