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Chapter 2 Practice Paper: Movement of Substances — question paper

QuizQuipPractice Series
QQ/S3CBI/CH2

Secondary 3 · Combined Science (Biology) (G2 / G3)

Chapter 2 Practice Paper

Movement of Substances

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

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • Biological drawings are not required; describe or label structures in words where asked.
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Biology) syllabus. It is not an official MOE or school examination paper. Chapter 2 (diffusion and its roles; osmosis and its effects on plant and animal tissues).

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

    Which process moves oxygen from the lung air sacs into the blood?

    1. Aosmosis
    2. Bdiffusion
    3. Cdigestion
    4. Dcondensation
    ( )
  2. 2

    In osmosis, water always moves

    1. Afrom concentrated to dilute solution
    2. Bup the temperature scale
    3. Cthrough a fully permeable membrane
    4. Dfrom dilute to concentrated solution
    ( )
  3. 3

    A cheek-lining cell in distilled water swells because

    1. Adistilled water is more concentrated than the cytoplasm
    2. Bwater enters by osmosis and no wall resists the swelling
    3. Cthe cell pumps water in
    4. Dthe membrane dissolves
    ( )
  4. 4

    A potato strip gains 6% of its mass after an hour in liquid X. Compared with the cell sap, liquid X is

    1. Amore concentrated
    2. Bsaltier
    3. Cmore dilute
    4. Dthe same concentration
    ( )
  5. 5

    At equilibrium, particles in a solution

    1. Acontinue moving equally in both directions
    2. Bstop moving
    3. Cmove only outward
    4. Ddissolve completely
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    A model is built with a tube of 2% sugar solution joined to a tube of 8% sugar solution by a partially permeable membrane. After one hour, the 8% side has risen by 2 cm.

    1. (a)

      Name the process responsible and define it.

      [3]
    2. (b)

      Explain why the 8% level rose.

      [3]
    3. (c)

      State the effect on the concentration of the 8% solution.

      [2]
  2. 2

    Three identical plant tissue strips were weighed, soaked in different liquids for 30 minutes, then reweighed.

    Results

    LiquidStart mass / gEnd mass / gChange / %
    P: pure water4.04.4________
    Q: dilute salt solution4.04.0________
    R: concentrated salt solution4.03.6________
    1. (a)

      Complete the percentage-change column.

      [3]
    2. (b)

      Explain the direction of water movement in strip P and in strip R.

      [3]
    3. (c)

      State what liquid Q tells us about the tissue.

      [1]
  3. 3

    A runner finishes training and is offered either a sports drink matched to body concentration or a bottle of distilled water.

    1. (a)

      State and explain the risk of drinking large amounts of distilled water for the runner's red blood cells.

      [2]
    2. (b)

      Explain why the matched sports drink avoids this problem.

      [2]
    3. (c)

      Name the property of cell membranes that makes water movement selective.

      [1]

— End of paper —