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3 marksThe Uptake and Transport of Water and Minerals

CAPE Biology Unit 2 · 2017 · Paper 2 · Question 2(b)(i)

Figure 4 shows the results of some experiments in which the effect of the closure of stomata on transpiration rate in a plant is studied. Two series of experiments are conducted, one in still air and the other under windy conditions.

With reference to the structure of stomata, explain the nature of the relationship between stomata and transpiration.

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Other parts of this question

  1. 2(a)(i)Identify the cross sections labelled I and II and for EACH, state ONE observable feature which justifies the given identification.[4 marks]
  2. 2(a)(ii)Comment on the main function of the region labelled III.[1 mark]
  3. 2(a)(iii)In BOX II, make a detailed drawing of the cross section labelled II. NOTE: No title or magnification is required.[3 marks]
  4. 2(b)(ii)Using the data given in Figure 4, compare the general trend in transpiration rates of the plant in still air and under windy conditions.[3 marks]
  5. 2(b)(iii)Suggest an explanation for the results obtained for the experiment done under windy conditions.[1 mark]

More practice: the rest of this paper · more The Uptake and Transport of Water and Minerals questions · all CAPE Biology Unit 2 past papers