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Immune system and immunity
Practice Questions

20 CIE IGCSE Biology questions on Immune system and immunity, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Immune system and immunity

Question 1 · 1 mark · Difficulty 1/3

Which of the following best describes an antigen?

  1. A protein produced by lymphocytes that destroys pathogens
  2. A foreign molecule that triggers an immune response
  3. A type of white blood cell that engulfs bacteria
  4. A chemical messenger that coordinates immune responses
Show answer & explanation
✓ Answer: B — A foreign molecule that triggers an immune response
Award 1 mark for recognizing that an antigen is a foreign molecule (usually protein or polysaccharide) on the surface of pathogens that stimulates antibody production. A describes antibodies, not antigens. C describes phagocytes. D describes cytokines or other immune signaling molecules.
Question 2 · 1 mark · Difficulty 2/3

A student investigated the effect of antibiotics on bacterial growth. Four agar plates were prepared with bacterial cultures and paper discs soaked in different concentrations of antibiotic. After 24 hours, clear zones appeared around the discs where bacteria had not grown. Which statement best explains the appearance of these clear zones?

  1. The antibiotic killed all bacteria on the plate
  2. The antibiotic prevented bacterial cell wall synthesis in that region
  3. The bacteria developed immunity to the antibiotic
  4. White blood cells destroyed the bacteria in the clear zone
Show answer & explanation
✓ Answer: B — The antibiotic prevented bacterial cell wall synthesis in that region
Award 1 mark for recognizing that antibiotics prevent bacterial cell wall synthesis, causing bacterial death in the zone of inhibition. A is incorrect because bacteria outside the clear zone continued to grow. C is incorrect because immunity refers to host immune responses, not bacterial resistance mechanisms shown in 24 hours. D is incorrect because this was an in vitro experiment with no white blood cells present.
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20 questions · 25 min · free

CIE IGCSE Biology: Immune system and immunity FAQ

How many CIE IGCSE Biology questions on Immune system and immunity are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Immune system and immunity for CIE IGCSE Biology, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Biology?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Immune system and immunity practice with other Biology topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Immune system and immunity questions aligned to the official CIE IGCSE Biology syllabus?
Every question is written against the published CIE IGCSE Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Immune system and immunity typically tested on CIE IGCSE Biology papers?
Immune system and immunity appears across multiple question types on real CIE IGCSE Biology papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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