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Osmosis
Practice Questions

40 AQA GCSE Biology questions on Osmosis, 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 Osmosis.

Try 2 sample questions on Osmosis

Question 1 · 1 mark · Difficulty 1/3

Which of the following is the correct definition of osmosis?

  1. The net movement of water molecules from a region of higher water potential to lower water potential through a partially permeable membrane
  2. The movement of solute particles from low concentration to high concentration across a cell membrane
  3. The net movement of water molecules from low water potential to high water potential through a partially permeable membrane
  4. The movement of any molecule from high to low concentration through a membrane
Show answer & explanation
✓ Answer: A — The net movement of water molecules from a region of higher water potential to lower water potential through a partially permeable membrane
Osmosis specifically describes the net movement of water molecules (not solute) across a partially permeable membrane, always from a region of higher water potential to lower water potential. Option C reverses the direction, which is a common student error.
Question 2 · 1 mark · Difficulty 1/3

What happens to red blood cells that are placed in pure water?

  1. They become turgid and stop taking in water
  2. They lose water by osmosis and shrivel
  3. They take in water by osmosis and burst
  4. Nothing happens, because animal cells cannot gain water
Show answer & explanation
✓ Answer: C — They take in water by osmosis and burst
Award 1 mark. Pure water is more dilute than the cytoplasm, so water enters. An animal cell has no cell wall to resist the swelling, which is why it bursts rather than becoming turgid as a plant cell would.
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20 questions · 25 min · free

AQA GCSE Biology: Osmosis FAQ

Is Kramizo free for AQA GCSE 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 Osmosis practice with other Biology topics or even switch to a totally different AQA 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 Osmosis questions aligned to the official AQA GCSE Biology syllabus?
Every question is written against the published AQA GCSE Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real AQA 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 AQA.
How is Osmosis typically tested on AQA GCSE Biology papers?
Osmosis appears across multiple question types on real AQA GCSE 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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