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Ans: (b) death of fish due to lack of oxygen.Explanation: Eutrophication is the natural aging of lake by the nutrient enrichment of its water. Due to which excessive growth of algal bloom. There is drastic decrease in oxygen in water bodies.
A lake which is rich in organic waste may result in (a) increased population of aquatic organisms due to minerals (b) drying of the lake due to algal bloom (c) increased population of fish due to lots of nutrients (d) mortality of fish due to lack of oxygen.