There is a decreased partial pressure of oxygen at high altitude compared to sea level. Which row is a correct description and reason for the response of the body to high altitude? [Figure: Table with columns 'description' and 'reason']
✓ Correct Answer
The correct answer is D: percentage saturation of haemoglobin with oxygen in lungs decreases so more red blood cells are produced to carry more haemoglobin
📋 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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