A-LevelBiologyGas exchangeOct/Nov 2018Paper 1 Q341 Mark
Cigarette smoke contains tar. Which statements describe the effect of tar on the respiratory system? 1 Tar causes goblet cells to increase the secretion of mucus. 2 Tar increases the risk of blood clots forming inside blood vessels. 3 Tar may cause changes to the DNA in epithelial cells.
A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct Answer
The correct answer is C. 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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