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3 marksEcosystem Dynamics and Community Stability

CAPE Environmental Science Unit 1 · 2013 · Paper 2 · Question 1(b)(i)

Table 1 provides data from an ecological study on insect diversity across three ecosystems: A, B, and C.

Calculate the species diversity for Ecosystem C using the provided formula: \[ D = \frac{N(N-1)}{\sum n(n-1)} \]

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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(a)(iii)Justify the advice given to a farmer that intercropping with legumes regularly could reduce the expenditure on nitrogen fertilizers.[5 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]

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