Ecologists recorded what each of five organisms in a coral reef habitat feeds on. The table shows all the feeding relationships between these organisms.
| Organism | Food source |
|---|---|
| Grouper | Damselfish |
| Algae | Makes its own food |
| Reef shark | Grouper |
| Zooplankton | Algae |
| Damselfish | Zooplankton |
Which organism is the apex predator in this habitat?
Damselfish
Grouper
Reef shark
Zooplankton
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.