A-LevelBiologyBiodiversity and conservation9700/12 · May/June 2010 · Q111 Mark
The diagram shows a tropical ocean food chain with 10% efficiency of energy transfer between trophic levels. phytoplankton → herbivorous zooplankton → carnivorous zooplankton → small fish → tuna Net primary production of phytoplankton is 1300 gm⁻³yr⁻¹. What is the net primary production per year for the carnivorous zooplankton and the tuna?
Anet primary production of carnivorous zooplankton /gm⁻³ yr⁻¹: 1.3 × 10¹; net primary production of tuna /gm⁻³ yr⁻¹: 1.3 × 10⁻¹
Bnet primary production of carnivorous zooplankton /gm⁻³ yr⁻¹: 1.3 × 10⁰; net primary production of tuna /gm⁻³ yr⁻¹: 1.3 × 10⁻²
Cnet primary production of carnivorous zooplankton /gm⁻³ yr⁻¹: 1.3 × 10⁻¹; net primary production of tuna /gm⁻³ yr⁻¹: 1.3 × 10⁻²
Dnet primary production of carnivorous zooplankton /gm⁻³ yr⁻¹: 1.3 × 10⁻²; net primary production of tuna /gm⁻³ yr⁻¹: 1.3 × 10⁻⁴
✓ Correct answer
A: net primary production of carnivorous zooplankton /gm⁻³ yr⁻¹: 1.3 × 10¹; net primary production of tuna /gm⁻³ yr⁻¹: 1.3 × 10⁻¹
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