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3 marksPollution and Environmental Health

CSEC Human and Social Biology · January 2008 · Paper 2 · Question 12(c)

Explain how agricultural runoff from farming near a river can result in the biological death of the river (eutrophication).

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Other parts of this question

  1. 12(a)(i)Identify which trophic position in a food chain (beginning, middle, or end) possesses the greatest amount of energy.[1 mark]
  2. 12(a)(ii)Identify at which point in a food chain photosynthesis takes place.[1 mark]
  3. 12(a)(iii)Construct a food chain showing the correct sequence among: big fish, water weed, small fish, and tadpole.[3 marks]
  4. 12(b)(i)Explain how weedicide accumulated to toxic levels in humans by analyzing its concentration across each trophic level of the marine food chain.[6 marks]
  5. 12(b)(ii)Explain how the physical removal of seaweed caused the collapse of marine life and death of local coral reefs.[6 marks]

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