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6 marksEcological Systems, Biodiversity and Conservations

CAPE Biology Unit 2 · 2005 · Paper 2 · Question 5(b)(i)

In Alaskan temperate forests there may be fewer than 50 tree and shrub species per hectare, while Guyanese forests have over 500 species per hectare. Discuss the effects of the variety of plant species in Guyana on the potential diversity of animal life.

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  1. 5(a)(i)Explain how a pyramid of numbers is constructed and, using TWO examples, explain why there may be inconsistencies in the shapes of the pyramid.[5 marks]
  2. 5(a)(ii)Explain why pyramids of standing crop biomass are more accurate in recording trophic level measurements and describe how they vary seasonally.[5 marks]
  3. 5(b)(ii)Discuss how the stability of an ecosystem is related to its species diversity.[4 marks]

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