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Gas exchange in humans
Practice Questions

43 CIE IGCSE Biology questions on Gas exchange in humans, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Gas exchange in humans

Question 1 · 1 mark · Difficulty 1/3

Which structure prevents food from entering the trachea during swallowing?

  1. Larynx
  2. Glottis
  3. Uvula
  4. Epiglottis
Show answer & explanation
✓ Answer: D — Epiglottis
The epiglottis is a flap of cartilage that folds over the entrance to the trachea when swallowing, directing food into the oesophagus. The larynx is the voice box, and the glottis is the opening between the vocal cords, neither of which performs this sealing function.
Question 2 · 1 mark · Difficulty 1/3

Which feature of alveoli is most important for efficient gas exchange?

  1. They contain cartilage rings to prevent collapse
  2. They have a large total surface area
  3. They are lined with ciliated epithelial cells
  4. They produce mucus to trap pathogens
Show answer & explanation
✓ Answer: B — They have a large total surface area
Award 1 mark for correct answer. Large surface area increases the rate of diffusion. A is incorrect — alveoli do not contain cartilage; this is a feature of the trachea and bronchi. C is incorrect — ciliated cells are found in the trachea and bronchi, not alveoli. D is incorrect — alveoli do not produce mucus as this would impair gas exchange.
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CIE IGCSE Biology: Gas exchange in humans FAQ

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 Gas exchange in humans 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 Gas exchange in humans 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 Gas exchange in humans typically tested on CIE IGCSE Biology papers?
Gas exchange in humans 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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