A-LevelBiologyGas exchangeOct/Nov 2014Paper 1 Q301 Mark
The graph shows a dissociation curve for haemoglobin. [Figure 30] Which are suitable labels for the x-axis and the y-axis?
Ax-axis: partial pressure of carbon dioxide, y-axis: percentage of haemoglobin
Bx-axis: partial pressure of oxygen, y-axis: percentage saturation of haemoglobin with oxygen
Cx-axis: percentage of haemoglobin, y-axis: partial pressure of oxygen
Dx-axis: percentage saturation of haemoglobin with oxygen, y-axis: partial pressure of carbon dioxide
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of gas exchange within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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