What topic does this question test?

This question tests Biodiversity and conservation in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Which exam paper is this question from?

This question appeared in the Cambridge A-Level Biology May/June 2010 examination, Paper 1 Variant 2 (9700_s10_qp_12.pdf).

A-LevelBiologyBiodiversity and conservationMay/June 2010Paper 1 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

The correct answer is 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

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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✓ Correct Answer

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