Which one of the following statements is NOT correct ?
Question:

Which one of the following statements is NOT correct ?

1. Eutrophication indicates that water body is polluted ?

2. The dissolved oxygen concentration below $6 \mathrm{ppm}$ inhibits fish growth

3.  Eutrophication leads to increase in the oxygen level in water

4. Eutrophication leads to anaerobic conditions

Correct Option: , 3

Solution:

Eutrophication leads to decrease in oxygen level of water.

$3^{\text {rd }}$ statement is incorrect

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