Which statements are correct effects of tar in tobacco smoke on the human gas exchange system? [Figure 33.1]
✓ Correct Answer
The correct answer is C: goblet cells are stimulated to secrete more mucus: ✓, mucus glands in the trachea are enlarged: ✗, mutations may occur in epithelial cells forming tumours: ✓, the activity of cilia in the airways is inhibited: ✓
📋 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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