A-LevelBiologyGas exchangeFeb/Mar 2016Paper 1 Q331 Mark
Some of the effects of smoking are listed. 1 It causes coughing. 2 It increases blood pressure. 3 It decreases the transport of oxygen. 4 It increases the risk of cancer. 5 It prevents cilia from moving. Which components of tobacco smoke cause these effects? [Figure 33.1]
Atar: 1, 3 and 4; carbon monoxide: 2; nicotine: 4 and 5
Btar: 1, 4 and 5; carbon monoxide: 3; nicotine: 2
Ctar: 1 and 5; carbon monoxide: 3 and 5; nicotine: 4
Dtar: 3 and 4; carbon monoxide: 1, 2 and 5; nicotine: 2 and 4
✓ Correct Answer
The correct answer is B: tar: 1, 4 and 5; carbon monoxide: 3; nicotine: 2
📋 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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