Immunity questions ask how the body recognises and removes pathogens, and how protection is gained. This hub gathers four lessons and a practice set that turn terms into explanations.
It belongs to the SPM Biology guide. The blood cells involved are introduced in transport in humans and animals.
What does the cluster cover?
Each lesson handles one step from a germ to a full explanation.
- Distinguishing non-specific and specific defence: general barriers versus targeted responses.
- Explaining antigen-antibody responses: how antibodies are made and what they do.
- Comparing active and passive immunity: two ways protection is gained.
- Reading immune-response graphs: turning a curve into an explanation.
How do the skills connect?
The defence lesson gives you the layers, and the antibody lesson shows how the specific layer works. The comparison lesson places two routes to protection side by side, and the graph lesson tests your understanding against data.
Together they move from layers to mechanism to comparison to evidence.
One example: a germ meets the body
Take an invented germ that lands on a cut on the skin. The broken skin is no longer a barrier, so the germ enters.
White blood cells called phagocytes engulf some germs, which is non-specific defence. Lymphocytes recognise the germ’s antigen and make matching antibodies, which is specific defence. The same event triggers both layers.
Where should you start?
If your answers mix barrier defences with antibodies, begin with the defence lesson. If you confuse vaccination with antiserum, start with the active and passive comparison. Students who stall at graphs should begin with the graph lesson.
When you finish, try the practice set and use the biological data interpretation trainer on your own answers. For teacher support, see online one-to-one Biology tuition.