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Sudden mass killing of fishes is likely in
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- mesotrophic lake
- oligotrophic lake
- salt lake
- eutrophic lake
Correct Option: D
Organic pollutants provide nutrients for stimulating growth of algae and other plants. Algal bloom reduces availability of light to submerged plants which get killed. The dead submerged plants consume more oxygen in decomposition. This reduces availability of oxygen to other life forms leading to death of organisms. This is known as eutrophication.