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3.1 Communicable diseases

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Question 37

A farmer vaccinates sheep against a communicable disease. This year, the proportion of sheep vaccinated is much lower than in previous years. An outbreak of the disease is now more likely.

Which explains why?

[1]
A

The vaccine works less well in each sheep if fewer sheep in the flock receive it

B

Unvaccinated sheep pass the pathogen to vaccinated sheep, which then become ill

C

More sheep are not immune, so the pathogen can be passed between more sheep

D

The pathogen becomes resistant to the vaccine as the number of vaccinated sheep falls

Markscheme

3.1 Communicable diseases Questions

  1. GCSE
  2. /Biology
  3. /3.1 Communicable diseases

252 exam-style questions on AQA GCSE Biology 3.1 Communicable diseases, covering 3.1.1 Communicable (infectious) diseases, 3.1.2 Viral diseases, 3.1.3 Bacterial diseases, 3.1.4 Fungal diseases, 3.1.5 Protist diseases, 3.1.6 Human defence systems, 3.1.7 Vaccination, 3.1.8 Antibiotics and painkillers, and 3.1.9 Discovery and development of drugs. Each one has a worked solution and a mark scheme showing where the marks go.

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