The primary source of organic pollution in fresh water bodies is
UGC NET - 2014,
Answer: C
The primary source of organic pollution in fresh water bodies is sewage effluents. Domestic sewage carries a large load of biodegradable organic matter, which bacteria decompose using dissolved oxygen and so raise the biochemical oxygen demand.
Run-off from urban areas and from farms carries mainly silt, nutrients and chemicals, and industrial effluents carry mainly toxic and inorganic pollutants. Sewage is the main organic source of the four.
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