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Chapter 2 Practice Paper: Movement of Substances — question paper

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QQ/S3BI/CH2

Secondary 3 · Biology (G2 / G3)

Chapter 2 Practice Paper

Movement of Substances

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is 30.

Original practice material written for the MOE Biology syllabus. It is not an official MOE or school examination paper. Diffusion and its roles in nutrient uptake and gaseous exchange, osmosis and its effects on plant and animal tissues, water-potential gradients, active transport, and osmosis experiments with percentage change in mass.

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

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    The movement of molecules from where they are more concentrated to where they are less concentrated is called

    1. Aosmosis
    2. Bactive transport
    3. Cdiffusion
    4. Dabsorption
    ( )
  2. 2

    A plant cell is placed in a solution more concentrated than its cell sap. What happens to the cell?

    1. AIt becomes turgid as water enters
    2. BIt becomes plasmolysed as water leaves
    3. CIt bursts because the wall cannot stretch
    4. DNothing, because walls block all movement
    ( )
  3. 3

    Which process moves mineral ions from the soil into root hair cells when the ions are already scarcer in the soil than in the root?

    1. Adiffusion
    2. Bevaporation
    3. Ctranspiration pull
    4. Dactive transport
    ( )
  4. 4

    Oxygen enters the blood in the lungs and carbon dioxide leaves it. Both gases cross the alveoli by

    1. Aosmosis
    2. Bactive transport
    3. Cdiffusion
    4. Dphagocytosis
    ( )
  5. 5

    A potato strip weighs 4.8 g. After soaking in pure water it weighs 5.2 g. The percentage change in mass is

    1. A+7.7%
    2. B+8.3%
    3. C−8.3%
    4. D+0.40%
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    A student places strips of the same potato into three liquids for 30 minutes: distilled water, a dilute sugar solution and a concentrated sugar solution.

    1. (a)

      State the direction of water movement in each strip, relative to the potato cells.

      [3]
    2. (b)

      Name the process responsible and define it.

      [2]
    3. (c)

      Describe how the strip in the concentrated solution would feel and look different from the strip in distilled water.

      [1]
  2. 2

    The table shows the masses of three identical potato strips before and after 30 minutes in different solutions.

    Potato strip masses

    SolutionStarting mass / gFinal mass / g
    A (distilled water)5.05.5
    B (dilute sugar)5.05.1
    C (concentrated sugar)5.04.4
    1. (a)

      Calculate the percentage change in mass for strip C.

      change =%[2]
    2. (b)

      Arrange solutions A, B and C in order of water potential, highest first.

      [2]
    3. (c)

      Explain why the strips were blotted dry before each weighing.

      [1]
    4. (d)

      State one variable the student must keep the same for the comparison to be fair.

      [2]
  3. 3

    Glucose absorption in the small intestine and ion uptake by roots both involve membrane transport.

    1. (a)

      Name the finger-like folds of the small-intestine lining that increase absorptive surface area, and the tiny membrane folds on the absorptive cells that enlarge the surface even further.

      [2]
    2. (b)

      Late in absorption, glucose is scarcer in the gut lumen than inside the epithelial cells. Name the process that continues uptake and state what powers it.

      [3]
    3. (c)

      Explain why root hair cells use the same process for mineral ions even though water enters them by osmosis.

      [2]

— End of paper —