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WABiologyQuick questions
Unit 4: Surviving in a Changing Environment
Quick questions on Epidemiology and disease control: WACE Year 12 Biology
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are control strategies?Show answer
You should be able to explain and evaluate a range of strategies and identify which link they target.
What is herd immunity?Show answer
Herd immunity occurs when a large enough proportion of a population is immune (through vaccination or prior infection) that the pathogen cannot spread easily, because most contacts an infected person has are with immune individuals. This indirectly protects those who are not immune, such as newborns or people who cannot be vaccinated.
What is antibiotic resistance as a control challenge?Show answer
The overuse and misuse of antibiotics has driven the evolution of resistant bacteria by natural selection: antibiotics kill susceptible bacteria, leaving resistant ones to reproduce and spread their resistance alleles. Strategies to slow resistance include prescribing antibiotics only when needed, completing prescribed courses, and developing new drugs. This links Unit 4 disease control back to the Unit 3 idea of selection.
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