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2 marksFood Chains, Food Webs, and Decomposers

CSEC Biology · January 2015 · Paper 2 · Question 2(b)(i)

Nitrogen is needed for the synthesis of proteins. In the liver, excess protein is converted to urea which is excreted by some animals.

Briefly describe ONE route by which the nitrogen excreted from animals (in the form of urea) is made available to plants.

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Other parts of this question

  1. 2(a)(i)Identify the structures labelled I, II, III, IV and V in Figure 3. I: II: III: IV: V:[5 marks]
  2. 2(a)(ii)Using the symbol, X, indicate on Figure 3, TWO places where protein digestion takes place.[2 marks]
  3. 2(a)(iii)Suggest TWO reasons why the locations indicated in (a)(ii) are suitable for protein digestion to take place.[2 marks]
  4. 2(a)(iv)Give TWO reasons why living organisms need protein.[2 marks]
  5. 2(b)(ii)Suggest TWO signs of nitrogen deficiency in plants.[2 marks]

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