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प्रश्न
Dissolved oxygen in water is very important for aquatic life. What processes are responsible for the reduction of dissolved oxygen in water?
उत्तर
The discharge of human sewage and organic waste from pulp and paper industry and presence of leaves, grass, trash etc. 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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