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6 marksEnergy Flow and Nutrient Cycling

CAPE Biology Unit 2 · 2015 · Paper 2 · Question 4(a)(i)

Ecological energy transfer and feeding relationships are traditionally represented using pyramid diagrams.

Explain why energy transfer between trophic levels is considered relatively inefficient, providing a brief definition of 'trophic level' and THREE reasons for this inefficiency.

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Other parts of this question

  1. 4(a)(ii)Briefly describe the THREE types of biological pyramids and comment on which type is the most useful for representing the productivity of EACH trophic level.[5 marks]
  2. 4(b)Outline the current view of the relationship between biological diversity and ecosystem stability, and briefly discuss evidence in support of this viewpoint.[4 marks]

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