1. Answer question ONE and any other THREE
2. Illustrate your answer with suitable examples, diagrams and figures wherever appropriate.
Q1. a) Explain the causes of global warming, and its possible effects on different ecosystems
b) Discuss energy flow in the ecosystem and its role in the ecosystem productivity
Q2. With the aid of diagrams, demonstrate the nitrogen cycle and outline the effect of human activity to its stability.
Q3. Discuss various ecological factors found in terrestrial forest ecosystems.
Q4. Discuss the following:
a) Parasitism (5mks)
b) Detrital food chain (5mks)
c) Impacts of human activities on phosphorous cycle (5mks)
Q5. Outline the pressures on aquatic ecosystems and discuss their causes (15mks)
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