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CXC · CSEC · Biology

Respiration and Gas Exchange
Practice Questions

71 CXC CSEC 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.

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Question 1 · 1 mark · Difficulty 1/3

A student in Trinidad observed that when she held her breath, she soon felt an urgent need to breathe. Which substance in the blood is primarily responsible for triggering this urge?

  1. Oxygen
  2. Carbon dioxide
  3. Nitrogen
  4. Water vapour
Show answer & explanation
✓ Answer: BCarbon dioxide
Award 1 mark for identifying carbon dioxide as the primary stimulus for breathing. A is incorrect — low oxygen levels are a secondary stimulus only. C is incorrect — nitrogen is not involved in respiratory regulation. D is incorrect — water vapour does not stimulate breathing.
Question 2 · 1 mark · Difficulty 1/3

Which feature of the alveoli in human lungs allows for efficient gas exchange?

  1. Thick walls to prevent gas leakage
  2. Small surface area to concentrate gases
  3. Walls that are one cell thick
  4. Dry inner surface to dissolve gases
Show answer & explanation
✓ Answer: CWalls that are one cell thick
Award 1 mark for recognising that thin walls reduce diffusion distance. A is incorrect — thick walls would slow diffusion. B is incorrect — large surface area is needed, not small. D is incorrect — the inner surface must be moist, not dry, to dissolve gases.
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CXC CSEC Biology: Respiration and Gas Exchange FAQ

How many CXC CSEC Biology questions on Respiration and Gas Exchange are there on Kramizo?
Kramizo currently has 71 exam-board-aligned practice questions on Respiration and Gas Exchange for CXC CSEC 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 CXC 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 CXC CSEC 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 CXC 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 CXC CSEC Biology syllabus?
Every question is written against the published CXC CSEC Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC 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 CXC.
How is Respiration and Gas Exchange typically tested on CXC CSEC Biology papers?
Respiration and Gas Exchange appears across multiple question types on real CXC CSEC 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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