CAIE A Level Biology 9700 · Infectious diseases
A health district in a tropical region recorded the annual number of malaria cases over five years. In Year 3, a campaign distributed insecticide-treated bed nets to all households in the district. The data are shown in the table below.
| Year | Number of malaria cases |
|---|---|
| 1 | 12,400 |
| 2 | 13,100 |
| 3 | 11,800 |
| 4 | 10,200 |
| 5 | 9,500 |
Explain the biological, social and economic factors that should be considered when implementing a bed net distribution programme to control malaria.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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