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The overuse of fertilisers in a farm res...

The overuse of fertilisers in a farm results in the runoff pollution of nearby river.
Which of the following graphs correctly represents the resulting changes in the levels of oxygen and bacteria in that river?

Text Solution

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The correct Answer is:
A
When chemical fertilisers are washed into the river, eutrophication occurs. This results in an increase in concentration of bacteria and a subsequent fall in oxygen concentration.
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