A-LevelBiologyGas exchangeFeb/Mar 2024Paper 1 Q371 Mark
Which statements about the function of tissues found in the human gas exchange system are correct? 1 Collagen in the bronchi prevents them collapsing. 2 Smooth muscle in the bronchioles can contract to increase the flow of air into the alveoli. 3 Elastic fibres in the alveoli stretch and recoil during breathing.
A1 and 2
B1 and 3
C2 and 3
D3 only
✓ Correct Answer
The correct answer is D: 3 only
📋 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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