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Topic 3 Practice Paper: Movement into and out of cells — question paper

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QQ/IGCSE-BIO/T3

IGCSE · Cambridge IGCSE Biology (Extended (Core + Supplement))

Topic 3 Practice Paper

Movement into and out of cells

Duration: 40 minutes
Total: 30 marks
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A contains ten multiple-choice questions. Choose one answer, A, B, C or D, for each.
  • Section B contains structured questions. Write your answers in the spaces provided.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total mark for this paper is 30.

Original practice material written against the Cambridge IGCSE Biology syllabus. It is not an official Cambridge examination paper. Topic 3: diffusion and its rate factors, osmosis and water potential, plant cell turgor and plasmolysis, active transport.

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

  1. 1

    Through which structure do dissolved substances pass as they diffuse into or out of a cell?

    1. AThe cell wall
    2. BThe cell membrane
    3. CA chloroplast
    4. DThe vacuole
    ( )
  2. 2

    Which statement about diffusion is correct?

    1. AIt moves particles down a concentration gradient
    2. BIt needs energy from respiration
    3. CIt only happens in plant cells
    4. DIt moves particles against the gradient
    ( )
  3. 3

    A sac of dialysis tubing filled with concentrated sugar solution is placed in distilled water. After an hour its mass has increased. Why?

    1. ASugar moved out of the sac
    2. BThe tubing absorbed water chemically
    3. CSugar moved in by active transport
    4. DWater moved into the sac by osmosis
    ( )
  4. 4

    A plant cell is placed in a concentrated salt solution. Which term describes it after the cytoplasm has shrunk from the wall?

    1. ATurgid
    2. BFlaccid
    3. CPlasmolysed
    4. DLysed
    ( )
  5. 5

    Why do plant cells not burst when placed in pure water?

    1. ATheir cell wall resists the outward pressure
    2. BThey stop absorbing water
    3. CThey pump water out by active transport
    4. DTheir membrane disappears
    ( )
  6. 6

    Which change would slow the diffusion of a dye through water?

    1. AIncreasing the temperature
    2. BUsing a more concentrated dye
    3. CCooling the water
    4. DUsing a shallower dish
    ( )
  7. 7

    Root hair cells contain many mitochondria. This helps them absorb ions because

    1. Amitochondria store ions
    2. Brespiration in mitochondria provides energy for active transport
    3. Cmitochondria make the cell wall
    4. Dions diffuse into mitochondria
    ( )
  8. 8

    Which process moves each named particle in the direction shown?

    ParticleDirection of movement
    Awaterdilute solution → concentrated solution, through a membrane
    Boxygenlow concentration → high concentration, using energy
    Ccarbon dioxidelow concentration → high concentration, using energy
    Dwaterconcentrated solution → dilute solution, through a membrane
    1. 9

      A strip of plant tissue gains 10% of its mass in water. Its original mass was 2.40 g. What was its final mass?

      1. A2.40 g
      2. B2.16 g
      3. C24.0 g
      4. D2.64 g
      ( )
    2. 10

      Protein carriers in the cell membrane are needed for

      1. Aactive transport
      2. Bdiffusion of oxygen
      3. Cosmosis
      4. Devaporation
      ( )

    Section B: Structured questions[20 marks]

    Answer all questions in the spaces provided.

    1. 11

      A crystal of potassium manganate(VII) dye is placed at the bottom of a tall jar of still water. After two hours the purple colour has spread halfway up the jar.

      1. (a)

        Name the process that spreads the dye through the water.

        [1]
      2. (b)

        Explain why the dye spreads even though the water is not stirred.

        [2]
      3. (c)

        State two changes to the investigation that would make the colour spread faster.

        [2]
      4. (d)

        State the energy source for this spreading.

        [1]
    2. 12

      Pieces of raw potato are placed in liquids of different concentrations for one hour. The table shows the results.

      LiquidOriginal mass / gFinal mass / gPercentage change in mass
      Distilled water2.402.64
      10% salt solution2.402.16
      1. (a)

        Complete the percentage change column, showing your working for the 10% salt solution.

        [3]
      2. (b)

        Explain the mass change of the potato piece in distilled water.

        [2]
      3. (c)

        State the term for the state of the potato cells in the 10% salt solution after one hour, and describe what has happened inside each cell.

        [2]
    3. 13

      A seedling is grown in soil where nitrate ions are at a much lower concentration than inside its root hair cells. A second seedling is grown in soil treated with a respiratory poison.

      1. (a)

        Explain why nitrate ions cannot enter the root hair cells by diffusion.

        [2]
      2. (b)

        Name the process by which nitrate ions enter the cells, and state the membrane structures involved.

        [2]
      3. (c)

        Predict whether the poisoned seedling still absorbs nitrate ions. Explain your answer.

        [2]
      4. (d)

        State one process, other than active transport, that continues in the poisoned seedling.

        [1]

    — End of paper —