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3 marksNutrient Cycles and Energy Flow

CAPE Environmental Science Unit 1 · 2012 · Paper 2 · Question 2(b)(ii)

A statement notes that in a food chain there is a unidirectional flow of energy from the sun to producers and then to consumers.

On the basis of the rule stated in (b)(i), explain why it will be more energy efficient for humans to eat corn rather than beef.

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Other parts of this question

  1. 2(a)Distinguish between 'gaseous biogeochemical cycles' and 'sedimentary biogeochemical cycles'. In your response give ONE example of a gaseous biogeochemical…[4 marks]
  2. 2(b)(i)State the ten per cent rule for the transfer of energy from one trophic level to the next in an ecosystem.[2 marks]
  3. 2(c)(i)Showing how you arrived at your answer, determine which TWO countries together have a combined total of 50% deforestation.[4 marks]
  4. 2(c)(ii)Based ONLY on the information presented in Figure 2, which country would most likely have experienced the greatest loss of biodiversity?[1 mark]
  5. 2(c)(iii)Identify the country where secondary ecological succession is LEAST likely to occur.[1 mark]
  6. 2(c)(iv)Justify your response in (c)(iii).[5 marks]

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