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3 marksWater and Waste Management

CSEC Human and Social Biology · May/June 2009 · Paper 2 · Question 1(b)(i)

Cycling of nitrogen and the role of bacteria.

Explain the role of nitrifying bacteria in making nitrates available to plants.

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Other parts of this question

  1. 1(a)(i)From the given list (respiration, digestion, osmosis, photosynthesis), identify the processes at I and II in Figure 1 and write the answers in the spaces…[2 marks]
  2. 1(a)(ii)Name the structure in the lungs responsible for gaseous exchange.[1 mark]
  3. 1(b)(ii)Explain how nitrates in the soil are returned to the atmosphere as nitrogen gas.[2 marks]
  4. 1(c)Suggest TWO other ways, besides the production of biogas, in which human beings can utilize decomposers to benefit their daily lives.[2 marks]

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