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2 marksNervous Co-ordination

CAPE Biology Unit 2 · 2006 · Paper 2 · Question 2(a)(ii)

Students investigated the effect of sodium ions on squid neuron action potentials using normal seawater (A) and 50:50 diluted seawater with distilled water (B).

State TWO differences between the peaks in A and B.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 2(a)(i)Use the grid provided to show the results in Table 1 graphically.[6 marks]
  2. 2(a)(iii)State ONE cause of the differences between the membrane potentials reached in A and B.[1 mark]
  3. 2(b)On the diagram in Figure 3, complete the labelling of the nerve cell.[1 mark]

More practice: the rest of this paper · more Nervous Co-ordination questions · all CAPE Biology Unit 2 past papers