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2 marksTransport Across Membranes

CSEC Biology · January 2012 · Paper 2 · Question 1(f)

Give TWO reasons why living organisms need to move substances in and out of their cells.

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Other parts of this question

  1. 1(a)List the apparatus and materials and describe the method of this investigation.[4 marks]
  2. 1(b)Construct a table to represent the data shown in Figure 1.[4 marks]
  3. 1(c)(i)Explain the results obtained when the potato strips were placed in pure water.[2 marks]
  4. 1(c)(ii)Explain the results obtained when the potato strips were placed in sugar solution less than 1.0 M and greater than 1.0 M.[4 marks]
  5. 1(c)(iii)Name the process responsible for the results obtained in this experiment.[1 mark]
  6. 1(c)(iv)Suggest ONE possible source of error in this experiment.[1 mark]
  7. 1(d)(i)Explain why the appearance of an animal cell would be different from that of a plant cell after immersion in pure water for 30 minutes.[3 marks]
  8. 1(d)(ii)Explain why the appearance of an animal cell would be different from that of a plant cell after immersion in concentrated sugar solution for 30 minutes.[3 marks]
  9. 1(e)Name another process by which substances can move in and out of cells.[1 mark]

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