Discussion
Eutrophication leads to the death of fish due to
Answer: D
Eutrophication leads to the death of fish by decreasing the dissolved oxygen content, option D: the excess nutrients cause algal blooms, and their decay uses up the oxygen.
Increasing oxygen would help fish, and decreasing algae would remove the cause of the problem, so options A and C are wrong.
The sequence in eutrophication is nutrient enrichment, an algal bloom, death and decay of the algae and consumption of dissolved oxygen by decomposers. The shortage of oxygen then kills fish. This is why increasing the oxygen is wrong, and decreasing the algae would stop the problem rather than cause it.
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