A-LevelBiologyGas exchangeMay/June 2020Paper 1 Q331 Mark
Carbon monoxide, nicotine and tar are components of tobacco smoke. Which row correctly describes their effect on a smoker's body? [Figure 33.1]
Acarbon monoxide: causes loss of consciousness at very low concentrations, nicotine: increases the diameter of blood vessels, tar: destroys cilia on cells lining the airways
Bcarbon monoxide: forms a stable compound with haemoglobin, nicotine: increases blood pressure, tar: stimulates goblet cells to secrete mucus
Ccarbon monoxide: forms carbaminohaemoglobin, nicotine: increases the diameter of the coronary artery, tar: settles on cells lining the airways
Dcarbon monoxide: forms carboxyhaemoglobin, nicotine: decreases the heart rate, tar: contains carcinogens
✓ Correct Answer
The correct answer is B. 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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