A-LevelBiologyGas exchangeMay/June 2011Paper 1 Q251 Mark
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']
Amore red blood cells because haemoglobin breaks down more rapidly
Bred blood cells have genes switched on so red blood cells produce more haemoglobin
Coxygen dissociation curve shifts to the right to compensate for an increase in oxygen unloading in tissues
Dpercentage saturation of haemoglobin with oxygen in lungs decreases so more red blood cells are produced to carry more haemoglobin
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The correct answer is D. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
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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...
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