The condition that indicates a polluted environment is
Question:

The condition that indicates a polluted environment is

1. BOD value of 5 ppm

2. eutrophication

3. $0.03 \%$ of $\mathrm{CO}_{2}$ in the atmosphere

4. $\mathrm{pH}$ of rain water to be $5.6$

Correct Option: , 2

Solution:

In Eutrophication nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity. If indicates polluted environment.