O-LevelBiologyEcology & Environment5090/11 · Oct/Nov 2012 · Q321 Mark
The presence of high concentrations of nitrogen-containing fertilisers in a pond can lead to the death of fish. What is the sequence of events leading to the death of the fish?
Aincrease in algae → algae die → increase in bacteria → drop in oxygen
Bincrease in algae → drop in oxygen → increase in bacteria → algae die
Cincrease in bacteria → drop in oxygen → increase in algae → algae die
Dincrease in bacteria → increase in algae → algae die → drop in oxygen
✓ Correct answer
A: increase in algae → algae die → increase in bacteria → drop in oxygen
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