What this practice covers
These questions are drawn from past CIE 9700 Biology papers and filtered to the immune system. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on the immune system, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying the immune system "makes an antibody to fit" a new pathogen. The lymphocyte with the right receptor already exists and is selected.
- Saying phagocytes are specific. They are non-specific; lymphocytes are specific.
- Mixing up where the two lymphocytes mature. B in bone marrow, T in thymus.
- Saying plasma cells are memory cells. Plasma cells secrete antibody and die within days; memory cells persist.
- Explaining the secondary response as "the body remembers", without naming memory cells and their rapid division into plasma cells.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: The immune system revision notes.