Practice Test 9

A lake downstream of a hog farm shows high nutrient concentrations and frequent algal blooms. Residents propose adding aerators to increase dissolved oxygen. Which statement best evaluates this proposal in terms of eutrophication?

A wastewater treatment plant reduces phosphorus discharge but not nitrogen discharge into a river feeding a lake. The lake had been experiencing eutrophication. In many freshwater systems, what is the most likely result of reducing phosphorus inputs?