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HomeCIE IGCSE Co-ordinated Science (Double Award)Air, water and the environment
CIE · IGCSE · Co-ordinated Science (Double Award)

Air, water and the environment
Practice Questions

20 CIE IGCSE Co-ordinated Science (Double Award) questions on Air, water and the environment, 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 Air, water and the environment.

Try 2 sample questions on Air, water and the environment

Question 1 · 1 mark · Difficulty 1/3

Which gas makes up approximately 78% of dry air by volume?

  1. Nitrogen
  2. Carbon dioxide
  3. Oxygen
  4. Argon
Show answer & explanation
✓ Answer: ANitrogen
Nitrogen makes up approximately 78% of dry air by volume. Oxygen accounts for about 21%, argon about 0.9%, and carbon dioxide only about 0.04%. Students often confuse the proportions of nitrogen and oxygen.
Question 2 · 1 mark · Difficulty 2/3

Which of the following is the main reason why carbon monoxide is harmful to humans?

  1. It combines irreversibly with haemoglobin, reducing oxygen transport
  2. It reacts with ozone in the lungs to produce toxic compounds
  3. It stimulates excess mucus production in the airways
  4. It dissolves in lung fluid to form carbonic acid
Show answer & explanation
✓ Answer: AIt combines irreversibly with haemoglobin, reducing oxygen transport
Carbon monoxide binds to haemoglobin with a much greater affinity than oxygen, forming carboxyhaemoglobin. This reduces the blood's ability to carry oxygen to body tissues, which can be fatal. Options A, B, and D describe incorrect mechanisms not associated with CO toxicity at IGCSE level.
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CIE IGCSE Co-ordinated Science (Double Award): Air, water and the environment FAQ

How many CIE IGCSE Co-ordinated Science (Double Award) questions on Air, water and the environment are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Air, water and the environment for CIE IGCSE Co-ordinated Science (Double Award), 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 Co-ordinated Science (Double Award)?
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 Air, water and the environment practice with other Co-ordinated Science (Double Award) 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 Air, water and the environment questions aligned to the official CIE IGCSE Co-ordinated Science (Double Award) syllabus?
Every question is written against the published CIE IGCSE Co-ordinated Science (Double Award) 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 Air, water and the environment typically tested on CIE IGCSE Co-ordinated Science (Double Award) papers?
Air, water and the environment appears across multiple question types on real CIE IGCSE Co-ordinated Science (Double Award) 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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