A-LevelBiologyGas exchangeFeb/Mar 2019Paper 1 Q311 Mark
The graph shows the oxygen dissociation curves of haemoglobin for eight species of mammal. [Figure shows oxygen dissociation curves for 8 mammals, with a key relating numbers 1-8 to decreasing order of size] Which conclusion is consistent with the data shown in the graph?
AThe haemoglobin of larger mammals will combine with oxygen at a lower partial pressure of oxygen than that of smaller mammals.
BThe haemoglobin of larger mammals will release oxygen at a higher partial pressure of oxygen than that of smaller mammals.
CThe metabolic activity of the mammal is directly proportional to the ability of its haemoglobin to release oxygen.
DThe size of the mammal is directly proportional to the ability of its haemoglobin to release oxygen.
✓ Correct Answer
The correct answer is A. 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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