Question

Which of the following statement(s) is/(are) the incorrect reason for eutrophication?
(A) excess usage of fertilisers

(B) excess usage of detergents

(C) dense plant population in water bodies

(D) lack of nutrients in water bodies that prevent plant growth

Choose the most appropriate answer from the option given below:

• A. (D) only
• B. (C) only
• C. (B) and (D) only
• D. (A) only

Answer 1

The correct option is A (D) only

Eutrophication is the process of natural ageing of lakes. When pesticides or fertilizers wiped out from agriculture field due to rain or excessive irrigation and enters into the water body. The entry of pesticide or fertilizers into the water body makes it nutrient enriched and supports algal bloom. The overgrowth of algae depletes the dissolved oxygen which leads to the death of other aquatic animals and increases the temperature of water.

Lack of nutrients in water bodies that prevent plant growth is not a reason for eutrophication