If BOD of river is high, it means that the river is:

Not polluted

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Very much polluted with inorganic chemicals

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Very much polluted with organic chemicals which are decomposed by micro-organisms

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Polluted with pesticides

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Solution

The correct option is C Very much polluted with organic chemicals which are decomposed by micro-organisms
BOD is the amount of oxygen required by bacteria to break down the organic matter present in certain volume of water. High BOD means high demand for oxygen, which means high levels of organic pollutants.

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