Food chains rarely contain more than five trophic levels. Which statement best explains why?
There are no predators large enough to eat the top consumer.
The producers cannot make enough oxygen for more consumers.
Too little biomass is left to support another trophic level.
Decomposers break down the top consumers before they are eaten.
61 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.