8 marksHuman Interaction and Ecosystem Investigation

CAPE Environmental Science Unit 1 · 2009 · Paper 2 · Question 3(d)

Assess TWO possible impacts on the ecosystem if the population of snails is significantly reduced by draining the waterway.

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3(a)With reference to Figure 2, describe the variation in the population size of BOTH organisms over the eight-month period.[4 marks]
3(b)Outline how predation may be of benefit to the prey population represented in Figure 2.[4 marks]
3(c)Explain how ONE density independent factor may impact the size of the snail population.[4 marks]

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