A-LevelBiologyInfectious diseases9700/12 · Feb/Mar 2016 · Q361 Mark
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]
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Anets treated with insecticide: kills all male mosquitoes, polystyrene balls: prevents adult mosquitoes from laying eggs
Bnets treated with insecticide: kills all mosquitoes, polystyrene balls: releases toxins that kill mosquito larvae
Cnets treated with insecticide: kills some mosquitoes, polystyrene balls: restricts the breathing of the mosquito larvae
Dnets treated with insecticide: prevents mosquitoes from breeding, polystyrene balls: reduces nutrient supply for mosquito larvae
✓ Correct answer
C: nets treated with insecticide: kills some mosquitoes, polystyrene balls: restricts the breathing of the mosquito larvae
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