A-LevelBiologyGas exchangeMay/June 2022Paper 1 Q341 Mark
Which row shows the change in concentration of some substances in red blood cells when carbon dioxide diffuses from active cells?
Adecreases
no change
no change
Bincreases
increases
increases
Cno change
decreases
increases
Dno change
increases
increases
✓ Correct Answer
The correct answer is D: no change increases increases
📋 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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