Which one of the following statements is NOT correct ?

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

Eutrophication indicates that water body is polluted ?
The dissolved oxygen concentration below $6 \mathrm{ppm}$ inhibits fish growth
Eutrophication leads to increase in the oxygen level in water
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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