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1 markThe Uptake and Transport of Water and Minerals

CAPE Biology Unit 2 · 2011 · Paper 2 · Question 2(a)(iv)

An apparatus (potometer) is set up to investigate the effect of environmental factors on the rate of transpiration.

State what should be done to ensure reliability of the results.

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Other parts of this question

  1. 2(a)(i)State the role of the syringe in the apparatus.[1 mark]
  2. 2(a)(ii)State TWO precautions that must be taken when setting up the apparatus in Figure 3.[2 marks]
  3. 2(a)(iii)State TWO measurements that must be recorded to calculate the rate of transpiration.[1 mark]
  4. 2(a)(v)Describe how this apparatus could be used to investigate the effect of sunlight on transpiration, and suggest a possible control for the experiment.[2 marks]
  5. 2(b)(i)Using arrows labelled A, B, and C, indicate on Figure 4 where: (a) A – water leaves the loop of Henle by osmosis; (b) B – sodium ions and chloride ions leave…[3 marks]
  6. 2(b)(ii)Account for the large number of mitochondria in the cells in the region of the loop of Henle labelled C.[1 mark]
  7. 2(b)(iii)Explain how the concentration of the urine of small mammals inhabiting a desert differs from that of small mammals inhabiting a moist tropical forest, and…[2 marks]
  8. 2(b)(iv)Identify the regions of the nephron which may not have been functioning properly when protein and glucose are detected in a human urine sample.[2 marks]

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