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4 marksFood Chains, Food Webs, and Decomposers

CSEC Biology · May/June 2011 · Paper 2 · Question 3(d)

In addition to energy, materials are also cycled through various trophic levels and the abiotic environment. Using a diagram of the nitrogen cycle, show FOUR named processes which assist in recycling nitrogen in the ecosystem.

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Other parts of this question

  1. 3(a)Explain the unique role of producers in the ecosystem.[1 mark]
  2. 3(b)(i)Identify A and B.[2 marks]
  3. 3(b)(ii)Using a named example, explain the role of B in the ecosystem.[2 marks]
  4. 3(c)(iii)Give ONE example of a decomposer and explain how a decomposer releases carbon dioxide to the atmosphere.[3 marks]
  5. 3(c)(iv)Suggest why energy from the sun flows in one direction while materials are cycled within the ecosystem.[2 marks]
  6. 3(e)State the name of the organism responsible for ONE of the processes named in (c) above.[1 mark]

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