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4 marksThe Uptake and Transport of Water and Minerals

CAPE Biology Unit 2 · 2005 · Paper 2 · Question 2(a)

Figure 3 shows photographs of an open stoma (A) and a closed stoma (B) on the under surface of a leaf.

Draw the stoma in Figure 3 (A) and the cells immediately surrounding it, as well as any other significant features, at twice the size of the specimen in the photograph (magnification x 2). Labels are not required.

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Other parts of this question

  1. 2(b)Account for the difference in shape of the accessory cell adjacent to the left guard cell in Figure 3 A as compared with B.[1 mark]
  2. 2(c)(i)Collect data from the diagram in Figure 4 and use it to construct a histogram showing the relationship between the time and the width of the stomatal pore over…[4 marks]
  3. 2(c)(ii)Account for the shape of the histogram between 11.00 a.m. and 3.00 p.m.[1 mark]

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