Two cultures, P and Q, contained the same species of alga and started with the same biomass. The cultures were kept under the same conditions, and the same amount of light reached each culture.
| Culture | Light energy reflected in kJ | Light energy passing through without reaching a chloroplast in kJ | New algal biomass in g dry mass |
|---|---|---|---|
| P | 700 | 2500 | 14 |
| Q | 300 | 1200 | 28 |
Water fleas feed on the algae.
State which culture captured more of the light that reached it. Give one piece of evidence from the table.
Suggest why culture Q could support a greater biomass of water fleas than culture P.
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.