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CIE · IGCSE · Biology

Respiration and Gas Exchange
Practice Questions

8 CIE IGCSE Biology questions on Respiration and Gas Exchange, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for Respiration and Gas Exchange.

Try 2 sample questions on Respiration and Gas Exchange

Question 1 · 1 mark · Difficulty 1/3

What is the equation for aerobic respiration?

  1. CO₂ + H₂O → glucose + O₂
  2. Glucose + O₂ → CO₂ + H₂O + energy
  3. Glucose → lactic acid
  4. Glucose → ethanol + CO₂
Show answer & explanation
✓ Answer: BGlucose + O₂ → CO₂ + H₂O + energy
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy (ATP). Occurs in mitochondria. Requires oxygen.
Question 2 · 1 mark · Difficulty 1/3

Where does gas exchange occur in humans?

  1. Trachea
  2. Alveoli in the lungs
  3. Bronchi
  4. Diaphragm
Show answer & explanation
✓ Answer: BAlveoli in the lungs
Alveoli are tiny air sacs at the ends of bronchioles. O₂ diffuses from alveoli into blood; CO₂ diffuses from blood into alveoli.
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CIE IGCSE Biology: Respiration and Gas Exchange FAQ

How many CIE IGCSE Biology questions on Respiration and Gas Exchange are there on Kramizo?
Kramizo currently has 8 exam-board-aligned practice questions on Respiration and Gas Exchange 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 Respiration and Gas Exchange 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 Respiration and Gas Exchange 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 Respiration and Gas Exchange typically tested on CIE IGCSE Biology papers?
Respiration and Gas Exchange 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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