Some of the requirements of an efficient gas exchange system are a large surface area and a short diffusion distance. What is correct about how alveoli are adapted to meet these requirements? [Table with columns 'large surface area', 'short diffusion distance' and rows A, B, C, D]
✓ Correct Answer
The correct answer is C: large surface area many folded interconnected alveoli, short diffusion distance capillaries are next to alveolus wall
📋 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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