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5 marksEnergy Flow and Nutrient Cycling

CAPE Biology Unit 2 · 2005 · Paper 2 · Question 5(a)(ii)

Explain why pyramids of standing crop biomass are more accurate in recording trophic level measurements and describe how they vary seasonally.

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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(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…[6 marks]
  3. 5(b)(ii)Discuss how the stability of an ecosystem is related to its species diversity.[4 marks]

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