WA1 Practice Paper: Cell Structure and Movement of Substances — question paper

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer.

1. 1

   Which structure controls the activities of a cell?

   1. Acytoplasm
   2. Bcell wall
   3. Cnucleus
   4. Dvacuole
   ( )
2. 2

   Which structure is present in a typical plant cell but absent from a typical animal cell?

   1. Acell membrane
   2. Bnucleus
   3. Cmitochondrion
   4. Dcell wall
   ( )
3. 3

   Which structure can only be seen with an electron microscope?

   1. Achloroplast
   2. Bcell wall
   3. Cnucleus
   4. Dribosome
   ( )
4. 4

   The long extension of a root hair cell helps absorption by

   1. Astoring water
   2. Bincreasing the surface area in contact with soil water
   3. Cproducing chlorophyll
   4. Dmaking the cell rigid
   ( )
5. 5

   A red blood cell has no nucleus. The advantage is

   1. Afaster division
   2. Bmore room for haemoglobin
   3. Cstronger walls
   4. Dbetter movement
   ( )
6. 6

   Diffusion is the net movement of particles

   1. Afrom lower to higher concentration
   2. Bfrom higher to lower concentration
   3. Cof water only
   4. Dthrough a fully permeable membrane only
   ( )
7. 7

   Osmosis is the diffusion of

   1. Aany dissolved substance
   2. Bwater from concentrated to dilute solution
   3. Cgases through stomata
   4. Dwater from dilute to concentrated solution through a partially permeable membrane
   ( )
8. 8

   A plant cell in pure water becomes firm but does not burst because

   1. Awater cannot enter
   2. Bthe cellulose wall resists the swelling
   3. Cthe vacuole pumps water out
   4. Dthe membrane disappears
   ( )
9. 9

   A red blood cell placed in concentrated salt solution will

   1. Ashrink
   2. Bswell and burst
   3. Cbecome firm
   4. Dstay unchanged
   ( )
10. 10

    Which change speeds up diffusion?

    1. Aa lower temperature
    2. Ba longer distance
    3. Ca steeper concentration gradient
    4. Da thicker barrier
    ( )

Section B: Structured questions[30 marks]

Answer all questions in the spaces provided.

1. 1

   The diagram description reads: a box-shaped cell with a stiff outer boundary, a thin inner boundary, grainy jelly with a dark round body, several green discs and one large clear space.

   1. (a)

      Identify the type of cell and give one reason.

      [2]
   2. (b)

      Name the stiff outer boundary and the dark round body.

      [2]
   3. (c)

      State the function of the green discs.

      [1]
   4. (d)

      Name the two structures inside this cell that need an electron microscope to be seen, and state one function of each.

      [4]
2. 2

   Three potato strips of equal mass were soaked for one hour.

   Results

   Liquid	Start mass / g	End mass / g
   P: pure water	5.0	5.4
   Q: solution matching cell sap	5.0	5.0
   R: concentrated salt solution	5.0	4.5

   1. (a)

      Calculate the percentage change in mass for each strip.

      [3]
   2. (b)

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

      [4]
   3. (c)

      State what strip Q shows about the liquid's concentration.

      [1]
   4. (d)

      State one visible difference between strip P and strip R at the end of the hour.

      [2]
3. 3

   A student investigates gaseous exchange and absorption.

   1. (a)

      Define diffusion.

      [2]
   2. (b)

      Describe one role of diffusion in humans and one role in plants.

      [2]
   3. (c)

      A dye front spreads 12 cm in 2 minutes. Calculate its spread rate.

      rate =cm per minute[2]
   4. (d)

      The dye front travels three times further in the same time in warmer water. State and explain the effect of temperature on diffusion.

      [3]
   5. (e)

      State the property of the cell membrane that controls which substances enter a cell.

      [2]