In an aquatic ecosystem experiencing eutrophication,levels of dissolved macronutrients and dissolved oxygen levels _____________.
A)increase; increase
B)remain stable; increase
C)increase; decease
D)decrease; increase
E)decrease; decrease

Question

Quizplus · Accepted Answer

During eutrophication, there is an increase in levels of dissolved macronutrients such as nitrogen and phosphorus due to runoff from fertilized lands or sewage discharge. This leads to an increase in primary productivity (growth of algae and aquatic plants) which in turn leads to a decrease in dissolved oxygen levels as the dead organic matter is decomposed by aerobic bacteria using up the available oxygen. Therefore, there is an increase in dissolved macronutrients and a decrease in dissolved oxygen levels.

In an Aquatic Ecosystem Experiencing Eutrophication,levels of Dissolved Macronutrients and Dissolved