One control method to reduce the spread of malaria is to use an insecticide. It can be used to treat mosquito nets. Another control method is to completely cover areas of water with insoluble polystyrene balls that float on the surface. Using this information, what are the reasons for these control methods? [Figure 36.1]
✓ Correct Answer
The correct answer is C: nets treated with insecticide: kills some mosquitoes, polystyrene balls: restricts the breathing of the mosquito larvae
📋 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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