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3 marksEnergy Flow and Nutrient Cycling

CAPE Biology Unit 2 · May/June 2021 · Paper 2 · Question 1(a)(iii)

Figure 2 shows a simplified nitrogen cycle involving plants in a natural ecosystem.

Animals may also be involved in the nitrogen cycle. Extend the diagram in Figure 2 to illustrate the involvement of animals in the nitrogen cycle.

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Other parts of this question

  1. 1(a)(i)In the space below, construct a table to represent the data given in Figure 1.[5 marks]
  2. 1(a)(ii)Identify the processes labelled A-E in Figure 2.[5 marks]
  3. 1(b)(i)State TWO similarities between fermentation (anaerobic respiration) reactions in animals and yeast.[2 marks]
  4. 1(b)(ii)Explain the function of the fermentation reactions in organisms.[3 marks]
  5. 1(c)(i)Discuss the importance of the following components of oxidative phosphorylation: The formation of a proton gradient.[12 marks]
  6. 1(c)(ii)Discuss the importance of the following components of oxidative phosphorylation: The synthesis of ATP.[12 marks]
  7. 1(c)(iii)Discuss the importance of the following components of oxidative phosphorylation: The role of oxygen.[12 marks]

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