Organisms in a glasshouse form a food chain.
| Organism group | How the organisms obtain food | Total dry biomass in kg |
|---|---|---|
| Pepper plants | Make biomass by photosynthesis | 920 |
| Aphids | Feed on the pepper plants | 115 |
| Lacewing larvae | Eat the aphids | 23 |
A student plans a pyramid of biomass using a scale of 1 mm to represent 10 kg of biomass.
| Position of bar | Organism group | Width of bar in mm |
|---|---|---|
| Bottom | Aphids | 11.5 |
| Middle | Pepper plants | 92.0 |
| Top | Lacewing larvae | 2.3 |
Evaluate the student's plan for the pyramid of biomass.
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.