A-LevelBiologyImmunityFeb/Mar 2024Paper 1 Q401 Mark
Measles is an infectious disease caused by a virus. The graph shows the number of cases of measles each year in a country before and after a vaccine was introduced. [Figure 40.1] What could have caused the decrease in the number of cases of measles after vaccination was introduced?
Avaccines provided artificial active immunity in people: ✓, vaccines provided artificial passive immunity in people: X, fewer people are able to act as hosts for the virus: ✓
Bvaccines provided artificial active immunity in people: X, vaccines provided artificial passive immunity in people: ✓, fewer people are able to act as hosts for the virus: ✓
Cvaccines provided artificial active immunity in people: ✓, vaccines provided artificial passive immunity in people: X, fewer people are able to act as hosts for the virus: X
Dvaccines provided artificial active immunity in people: ✓, vaccines provided artificial passive immunity in people: ✓, fewer people are able to act as hosts for the virus: X
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of immunity within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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