Question

Eutrophication in lakes takes place due to :

• A. excess of dissolved $O_2$
• B. increase in pH of soil
• C. high concentration of phosphate nutrients in water
• D. dissolved fluorides

Answer 1

The correct option is C high concentration of phosphate nutrients in water

Eutrophication is a natural phenomenon with nutrients such as potassium, phosphorus from mineral formations. But mostly, the major cause of eutrophication is created by phosphate nutrients from fertilizer wastes or industrial effluents.

Hence, the correct option is $\left(C\right)$