CAIE A Level Biology 9700 · Immunity
The table below shows the percentage of children vaccinated against a viral disease and the number of reported cases in two regions of a country over one year.
| Region | Vaccination coverage (%) | Number of reported cases |
|---|---|---|
| Eastshire | 95 | 25 |
| Westshire | 72 | 410 |
Explain how the difference in vaccination coverage between the two regions could lead to the difference in the number of reported cases.
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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.