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5 marksNutrient Cycles and Energy Flow

CAPE Environmental Science Unit 1 · 2005 · Paper 2 · Question 2(a)

Figure 1 illustrates a marine ecosystem food web with organisms including algae, sea urchin, jellyfish, turtle, starfish, parrotfish, octopus, barracuda, and shark.

Group the organisms shown in the food web in their respective trophic levels.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 2(b)Explain how energy becomes incorporated in this ecosystem.[5 marks]
  2. 2(c)Only a small percentage of energy incorporated into the ecosystem is available to the barracuda. Suggest TWO reasons for this.[4 marks]
  3. 2(d)Explain how this community might be altered if the population of sea urchins died out.[6 marks]

More practice: the rest of this paper · more Nutrient Cycles and Energy Flow questions · all CAPE Environmental Science Unit 1 past papers