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Diffusion
Practice Questions

20 CIE IGCSE Biology questions on Diffusion, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Diffusion

Question 1 · 1 mark · Difficulty 1/3

Which statement best defines diffusion?

  1. The movement of water molecules from a region of high water potential to a region of low water potential through a partially permeable membrane
  2. The net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient
  3. The movement of particles from a region of lower concentration to a region of higher concentration using energy from respiration
  4. The net movement of particles from a region of lower concentration to a region of higher concentration down a concentration gradient
Show answer & explanation
✓ Answer: B — The net movement of particles from a region of their higher concentration to a region of their lower concentration down a concentration gradient
Award 1 mark for the correct definition. A is incorrect — this describes osmosis, not diffusion. C is incorrect because diffusion does not require energy from respiration; this describes active transport. D is incorrect because diffusion occurs from higher to lower concentration, not lower to higher.
Question 2 · 1 mark · Difficulty 2/3

A student placed a crystal of potassium permanganate at the bottom of a beaker of water at 20°C and left it undisturbed. After 2 hours, the purple colour had spread throughout the water. Which factor is responsible for this spreading of colour?

  1. Active transport of potassium permanganate molecules
  2. Osmosis of water molecules into the crystal
  3. Diffusion of potassium permanganate molecules
  4. Convection currents in the water
Show answer & explanation
✓ Answer: C — Diffusion of potassium permanganate molecules
Award 1 mark for diffusion of potassium permanganate molecules. A is incorrect because active transport requires energy and membrane proteins, neither present here. B is incorrect because osmosis refers only to water movement through a partially permeable membrane. D is incorrect because the water was left undisturbed and the spreading occurs due to particle movement, not bulk water movement.
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CIE IGCSE Biology: Diffusion FAQ

How many CIE IGCSE Biology questions on Diffusion are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Diffusion 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 Diffusion 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 Diffusion 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 Diffusion typically tested on CIE IGCSE Biology papers?
Diffusion 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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