Question 4
FThe figure shows a pyramid of biomass for a food chain in a lake.
Figure: A pyramid of biomass for a food chain in a lake, drawn to scale
a.[1]
Name the organism at trophic level 1 in this food chain.
b.[1]
Give the biomass of the water snails.
c.[2]
Explain why the bar for the ducks is narrower than the bar for the water snails.
7.4 Trophic levels in an ecosystem Questions
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.