Scientists recorded four organisms in a rainwater storage tank.
| Organism | Observation |
|---|---|
| W | W is a green alga. |
| X | X eats Z. |
| Y | Y eats W. |
| Z | Z eats Y. |
Explain why organism W is at trophic level 1.
Give the trophic level of organism X. Explain your answer.
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.