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Study the graph given below. Explain how is oxygen concentration affected in the river when sewage is discharged into it?

Explanation:

1. It causes high mortality rate among aquatic animals. The excessive nutrients facilitate algal growth causing algal bloom.

2. There is a decline in dissolved oxygen from the point of sewage discharge . It is because of biodegradation of organic matter in the receiving water body which consumes dissolved oxygen. It leads to fish mortality as well as other aquatic forms.

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