What correctly describes the significance of the increase of the red blood cell count of humans who move from living at low altitude to high altitude?
✓ Correct Answer
The correct answer is A: After a few weeks at high altitude, the number of red blood cells increases to compensate for the lower availability of oxygen in the air.
📋 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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