A-LevelBiologyGas exchangeOct/Nov 2020Paper 1 Q331 Mark

The partial pressure of oxygen in air inside alveoli is 14 kPa. The partial pressure of oxygen in pulmonary capillaries is 6 kPa. What will be the effect of these partial pressures on diffusion?

Q: What topic does this question test?

This question tests Gas exchange in A-Level Biology (syllabus code 9700). It is worth 1 mark.

ACarbon dioxide will not diffuse in any direction.

BOxygen will diffuse from alveoli into capillaries.

COxygen will diffuse from capillaries into alveoli.

DOxygen will diffuse equally in both directions.

✓ Correct Answer

The correct answer is B: Oxygen will diffuse from alveoli into capillaries.

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Gas exchange in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology Oct/Nov 2020 examination, Paper 1 Variant 2.

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