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Osmosis
Practice Questions

20 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. A. The movement of any molecule from high to low concentration through a membrane
  2. B. The net movement of water molecules from a region of higher water potential to lower water potential through a partially permeable membrane
  3. C. The movement of solute particles from low concentration to high concentration across a cell membrane
  4. D. The net movement of water molecules from low water potential to high water potential through a partially permeable membrane
Show answer & explanation
✓ Answer: B — B. 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 D reverses the direction, which is a common student error.
Question 2 · 1 mark · Difficulty 2/3

A student places a piece of potato (mass 5.0 g) into a concentrated salt solution. After 30 minutes the potato is removed, dried, and reweighed at 4.2 g. What is the percentage change in mass?

  1. A. -8.0%
  2. B. -16.0%
  3. C. +16.0%
  4. D. -19.0%
Show answer & explanation
✓ Answer: B — B. -16.0%
Percentage change = ((final − initial) / initial) × 100 = ((4.2 − 5.0) / 5.0) × 100 = (−0.8 / 5.0) × 100 = −16.0%. The negative sign shows the potato lost mass because water moved out by osmosis into the more concentrated solution.
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20 questions · 25 min · free

AQA GCSE Biology: Osmosis FAQ

How many AQA GCSE Biology questions on Osmosis are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Osmosis for AQA GCSE 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 AQA 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 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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