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1 markMembrane Structure and Function

CAPE Biology Unit 1 · 2004 · Paper 2 · Question 1(a)(iii)

Figures 1 and 2 show the appearance of cells when placed in salt solutions of different water potentials. Figure 1 shows red blood cells in three different states (Photograph 1, 2, 3), and Figure 2 shows plant cells in two different states (Photograph 4, 5).

On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.

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Other parts of this question

  1. 1(a)(i)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.[5 marks]
  2. 1(a)(ii)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.[1 mark]
  3. 1(a)(iv)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.[1 mark]
  4. 1(a)(v)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.[1 mark]
  5. 1(b)(i)Suggest why the sizes of the red blood cells in photographs 1 – 3 change.[1 mark]
  6. 1(b)(ii)Suggest why the sizes of the plant cells in photographs 4 – 5 do not change.[1 mark]
  7. 1(c)Calculate the increase in size of red blood cells in photograph 3 over those in photograph 1.[1 mark]
  8. 1(d)When plant cells appear as in photograph 5, what is the specific name given to this condition?[1 mark]
  9. 1(e)Name THREE processes by which water and solutes can enter into a living plant or animal cell.[1 mark]

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