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Which one of the following statements is NOT correct ?

1. Eutrophication indicates that water body is polluted ?
2. The dissolved oxygen concentration below 6 ppm inhibits fish growth
3. Eutrophication leads to increase in the oxygen level in water
4. Eutrophication leads to anaerobic conditions

Correct answer: Eutrophication leads to increase in the oxygen level in water

Solution

Eutrophication typically results in an overgrowth of algae, which can deplete oxygen levels in the water as the algae die and decompose, leading to hypoxic or anaerobic conditions rather than an increase in oxygen.

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