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Respiration and Gas Exchange
Practice Questions

104 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.

Try 2 sample questions on Respiration and Gas Exchange

Question 1 · 1 mark · Difficulty 1/3

A student in Barbados observed the underside of a sugar cane leaf under a microscope and noticed small openings surrounded by pairs of curved cells. What is the name of these openings?

  1. Lenticels
  2. Stomata
  3. Root hairs
  4. Cuticles
Show answer & explanation
✓ Answer: B — Stomata
Award 1 mark for identifying stomata as the small openings on leaf surfaces surrounded by guard cells. A is incorrect — lenticels are found on stems and bark, not leaf surfaces. C is incorrect — root hairs are extensions of root epidermal cells for absorption. D is incorrect — the cuticle is a waxy layer covering the leaf surface, not an opening.
Question 2 · 1 mark · Difficulty 1/3

During gaseous exchange in the alveoli, oxygen moves into the blood by which process?

  1. Active transport
  2. Diffusion
  3. Filtration
  4. Osmosis
Show answer & explanation
✓ Answer: B — Diffusion
Award 1 mark for identifying diffusion as the movement of oxygen from high concentration in the alveoli to low concentration in the blood. D is incorrect — osmosis refers specifically to water movement. A is incorrect — active transport requires energy and is not used for gas exchange. C is incorrect — filtration involves pressure differences through a membrane, not concentration gradients.
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CXC CSEC Biology: Respiration and Gas Exchange FAQ

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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