A-LevelBiologyGas exchangeOct/Nov 2019Paper 2 Q27 Marks
People who smoke tobacco are at an increased risk of developing non-infectious diseases of the gas exchange system and the cardiovascular system. In 2004, a study was carried out on the most popular brands of filter cigarettes from each of the six World Health Organization (WHO) regions. In this study, the smoke passing through the filter was analysed for the tar, nicotine and carbon monoxide (CO) content for each brand of cigarette. For each WHO region, the mean content of tar, nicotine and carbon monoxide of the different brands of cigarette was calculated. The results are shown in Fig. 2.1. Key to WHO regions AFRO = African Region AMRO = Region of the Americas EMRO = Eastern Mediterranean Region EURO = European Region SEARO = South-East Asia Region WRPO = Western Pacific Region [Figure 2.1]
📋 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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