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6 marksThe Kidney, Excretion and Osmoregulation

CAPE Biology Unit 2 · 2009 · Paper 2 · Question 5(b)(ii)

With reference to THREE structural features, discuss how the proximal convoluted tubule is ideally suited to the function of selective re-absorption.

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Other parts of this question

  1. 5(a)(i)Explain how hormones contribute to the maintenance of a fairly constant internal environment in animals despite external environmental changes.[5 marks]
  2. 5(a)(ii)Suggest TWO other ways in which ethene plays a regulatory role in plants besides speeding up the ripening of fruits.[2 marks]
  3. 5(b)(i)Distinguish between 'ultra-filtration' and 'selective re-absorption' in relation to urine formation.[2 marks]

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