Lesson 4.1.3.2

4.1.3.2 Osmosis Quiz: AQA Combined Science, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.1.3.2, Osmosis: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 1: Cell biology, written with Revision Ninja.

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The 20 questions

  1. What term describes the diffusion of water across a partially permeable membrane?

    • Osmosis
    • Respiration
    • Transpiration
    • Active transport

  2. During osmosis, in which direction does net water movement occur?

    • High pressure to low
    • Concentrated to dilute
    • Active transport direction
    • Dilute to concentrated

  3. What type of membrane is required for osmosis to take place?

    • Impermeable
    • Freely permeable
    • Partially permeable
    • Rigid cellulose

  4. Which compound measure is used to describe the rate of water uptake in plants?

    • Surface area per time
    • Mass change per time
    • Volume change per mass
    • Length change per volume

  5. Which required practical investigates salt or sugar solution concentrations?

    • Required practical 2
    • Required practical 3
    • Required practical 1
    • Required practical 4

  6. What does required practical 2 measure in plant tissue?

    • Surface area
    • Internal temperature
    • Change in mass
    • Protein content

  7. How is percentage mass change calculated in osmosis practicals?

    • (Final ÷ original) × 100
    • (Change ÷ final) × 100
    • (Original ÷ change) × 100
    • (Change ÷ original) × 100

  8. How is osmosis scientifically classified in relation to diffusion?

    • Type of active transport
    • Special case of diffusion
    • Enzyme-catalysed reaction
    • Form of respiration

  9. A potato strip is 5.0 g at the start and 5.5 g at the end. What is the percentage change?

    • 10% loss
    • 0.5% gain
    • 10% gain
    • 5% gain

  10. A tissue sample falls from 4.0 g to 3.2 g. What is the percentage change?

    • 20% gain
    • 0.8% loss
    • 20% loss
    • 80% loss

  11. Why does plant tissue gain mass when placed in pure water?

    • Water enters by osmosis
    • Sugars enter actively
    • Cells undergo mitosis
    • Solutes diffuse outwards

  12. What causes potato pieces to lose mass in a concentrated sugar solution?

    • Sugar loss by diffusion
    • Active transport of salts
    • Evaporation from cells
    • Water loss by osmosis

  13. A tissue's mass rises from 10 g to 12 g over 2 hours. What is the rate of mass gain?

    • 12 g per hour
    • 1 g per hour
    • 2 g per hour
    • 0.5 g per hour

  14. Which way does water move when cell sap is more concentrated than the external solution?

    • Into the cell
    • Through active transport
    • Out of the cell
    • No net movement

  15. Which type of external solution draws water out of plant tissue?

    • Pure water
    • Concentrated solution
    • Dilute solution
    • Isotonic solution

  16. What does a zero percentage mass change indicate in a plant tissue osmosis graph?

    • Pure water
    • Equal concentration
    • Active transport stopped
    • Maximum absorption

  17. A 20 g tissue loses 15% of its mass. What is its final mass?

    • 15 g
    • 5 g
    • 23 g
    • 17 g

  18. What does a percentage mass gain in a plant tissue practical indicate?

    • Dilute external solution
    • Boiled plant tissue
    • Concentrated external solution
    • Isotonic external solution

  19. A tissue of mass 8 g gains 1.2 g. What is the percentage gain?

    • 1.2%
    • 15%
    • 8%
    • 12%

  20. What is the key property of the membrane used to demonstrate osmosis?

    • Fully permeable
    • Rigid cellulose
    • Partially permeable
    • Impermeable

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