8 marksNutrient Cycles and Energy Flow

CAPE Environmental Science Unit 1 · 2004 · Paper 2 · Question 3(b)

Outline four reasons for assigning trophic levels to each organism in an ecosystem.

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3(a)Give four reasons why, in an ecosystem, a food web is generally more useful than a food chain.[4 marks]
3(c)With reference to Figure 2, explain why it is more energy efficient for humans to eat at lower trophic levels.[8 marks]

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