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Dissolved oxygen in wate is very importa...

Dissolved oxygen in wate is very important for aquatic life. What process are responsible for the reduction of dissolved oxygen in water ?

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The discharge of human sewage and organic waste from pulp and paper industry and presence of leaves grass, trash in water due to run off result in phytoplankton growth. The microorganisms which decompose this organic matter need oxygen. Hence, the amount of oxygen in water of lakes etc. decreases
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