Question

Eutrophication is due to

• A. $S O_{4}^{2-}$ ion present in water
• B. $NaCl$ present in water
• C. $PO_{4}^{3-}$ present in water
• D. heavy metal present in water

Answer 1

Answer: (C)

$PO_{4}^{3-}$ present in water

Answer 2

Eutrophication is due to the presence of $PO_{4}^{3-}$ ion in water. Phosphates (plant nutrients) encourage the formation of algae and reduces $DO$ concentration of water.