If based on your explanation of the question, the \"bacteria graph\" is correct. Nutrients should increase only after part G as fertilisers were washed into the river after part G. Thus, nutrient graph is incorrect. Thanks for the clarification. :thankyou:

Could anyone please post the full question on the fertiliser that was thrown into the river and fishes died. Follow by those graph on nutrient and bacteria etc? My boy only explained to me briefly. He asleep now. Thanks!

One of the pollution by human activity: Increase in fertilizers to grow more food. These results in an increase in nutrients (nitrates and phosphates) in the water which causes enhanced plant growth (algal blooms). When this plant material dies and decays the bacteria uses the oxygen in the water. This lowering of oxygen levels results in the death of other water life that needs oxygen to survive, eg. fish, etc. This process is called eutrophication; litter, which causes disease and has a negative visual impact.


Ans to that mcq is nutrients. My boy put \"nutrients\".