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1 markHuman Impact on the Environment

CSEC Biology · January 2009 · Paper 2 · Question 4(c)(ii)

Farmers use fertilisers to increase crop yield.

Some farmers choose to use chemical fertilisers, while others use natural fertilisers. Suggest TWO disadvantages of the use of chemical fertilisers.

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Other parts of this question

  1. 4(a)With the aid of a balanced equation, describe the process by which green plants make their food.[6 marks]
  2. 4(b)(i)Tomato plants infested with a population of caterpillars[4 marks]
  3. 4(b)(ii)Water plants rooted to the bottom of a pond in which there is a proliferation (sudden large population) of algae[1 mark]
  4. 4(c)(i)How does the use of fertilisers increase crop yield?[5 marks]
  5. 4(c)(iii)Suggest ONE beneficial effect of organic fertilisers on soil.[1 mark]

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