A-LevelBiologyGas exchangeOct/Nov 2018Paper 1 Q351 Mark
Symptoms of chronic obstructive pulmonary disease (COPD) include a cough, breathlessness and chest infections. Some of the changes in the lungs that result from smoking are listed. 1 Alveoli lose elastin and collapse. 2 Bacteria accumulate in the mucus. 3 Cilia are inactivated. 4 Goblet cells secrete more mucus. Which changes cause the cough in COPD?
A1, 2, 3 and 4
B1 and 4 only
C2 and 3 only
D3 and 4 only
✓ Correct Answer
The correct answer is D: 3 and 4 only
📋 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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