A-LevelBiologyImmunityMay/June 2021Paper 1 Q361 Mark

Which statement explains why a one-dose vaccination programme for measles has not yet eliminated the disease?

Q: What topic does this question test?

This question tests Immunity in A-Level Biology (syllabus code 9700). It is worth 1 mark.

AMany infants under the age of eight months have passive immunity.

BSome children need several booster doses to develop full immunity.

CThe one-dose measles vaccine has a success rate of 93%.

DThe virus does not often change its antibodies.

✓ Correct Answer

The correct answer is B: Some children need several booster doses to develop full immunity.

📋 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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About This A-Level Biology Question

Topic

This multiple-choice question tests Immunity in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2021 examination, Paper 1 Variant 2.

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