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5 marksNutrient Cycles and Energy Flow

CAPE Environmental Science Unit 1 · 2013 · Paper 2 · Question 1(a)(iii)

Figure 1 illustrates the nitrogen cycle with key biological transformations labelled as Processes I, II, and III.

Justify the advice given to a farmer that intercropping with legumes regularly could reduce the expenditure on nitrogen fertilizers.

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Other parts of this question

  1. 1(a)(i)Name the types of bacteria responsible for allowing Processes I, II, and III to occur.[3 marks]
  2. 1(a)(ii)Explain THREE ways in which human activities can alter the nitrogen cycle.[6 marks]
  3. 1(b)(i)Calculate the species diversity for Ecosystem C using the provided formula: \[ D = \frac{N(N-1)}{\sum n(n-1)} \][3 marks]
  4. 1(b)(ii)Identify which of the three ecosystems is likely to better withstand an ecological disturbance, giving ONE reason for your answer.[3 marks]

More practice: the rest of this paper · more Nutrient Cycles and Energy Flow questions · all CAPE Environmental Science Unit 1 past papers