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1 markFood Chains, Food Webs, and Decomposers

CSEC Biology · January 2008 · Paper 2 · Question 1(f)(ii)

Environmental conditions affect seed germination and the functioning of soil inhabitants, including microorganisms.

Identify ONE cycle which depends on the activities of microorganisms.

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Other parts of this question

  1. 1(a)(i)Describe the reaction rate between points A and B, and between points B and C in Figure 1.[2 marks]
  2. 1(a)(ii)What is the optimum temperature for the enzyme in this reaction?[1 mark]
  3. 1(b)Using information in Figure 1, construct in the space provided below, a table to show the data obtained by the student in investigating the rate of enzyme…[8 marks]
  4. 1(c)(i)If the enzyme used in this investigation were amylase, describe fully the method you would use to obtain the data for the graph. Identify the materials and…[7 marks]
  5. 1(c)(ii)Identify ONE source of error in the investigation.[1 mark]
  6. 1(d)(i)What process might be taking place to soften the meat?[1 mark]
  7. 1(d)(ii)Suggest why this may be so.[2 marks]
  8. 1(e)(i)Suggest TWO ways in which water helps the process of germination.[2 marks]
  9. 1(e)(ii)Apart from water, state TWO environmental conditions needed for germination.[2 marks]
  10. 1(f)(i)Name TWO important groups of microorganisms whose activities are influenced by environmental conditions.[2 marks]
  11. 1(f)(iii)Explain the importance of the microorganisms named in (f)(i) in natural cycles.[2 marks]

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