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WABiologyQuick questions
Unit 4: Surviving in a Changing Environment
Quick questions on Immunity and vaccination: 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 is types of immunity?Show answer
Immunity is grouped along two axes: active versus passive, and natural versus artificial.
What is herd immunity?Show answer
Herd immunity is protection at the population level. When a high enough proportion of a population is immune (through vaccination or prior infection), the pathogen cannot find enough susceptible hosts to keep spreading. This protects even those who cannot be vaccinated, such as newborns or people with weakened immune systems.
What are the role of immunisation programs?Show answer
Australia runs a National Immunisation Program that provides scheduled vaccines from infancy. High coverage has dramatically reduced diseases that were once common. The program relies on maintaining high participation precisely to preserve herd immunity, showing how individual immunity and population protection are linked.
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