Question

All of the following statements about eutrophication is true except

• A. It is caused by acid rain.
• B. It is caused by the addition of nutrients to a water system.
• C. It is most harmful when there is little flow through in the system.
• D. Phosphorus is the main causal agent.
• E. Humans are responsible for most eutrophication.

Answer 1

The correct option is A It is caused by acid rain.

Eutrophication means increased pollutant due to algal blooms as supported by the presence of excess organic compounds in water. Agricultural runoff and dumping of organic and household waste in water bodies increases the organic content of water and favors the growth of dense growth of plant life. The stagnant or water bodies with the little flow are affected more adversely as little/no flow does not remove the organic nutrient from it. Household waste is rich in phosphorus which in turn favors the growth of algae, plankton and other simple plants over complex one and thereby causing intense water pollution. Thus, the correct answer is option A.