SAT Subject Biology Practice Question 198: Answer and Explanation
8. Which describes the cause of eutrophication in lakes?
A. A lack of oxygen
B. A lack of sunlight
C. A lack of nutrients
D. An excess of oxygen
E. An excess of nutrients
Correct Answer: E
Eutrophication, or the growth of algae, is caused by an excess of dissolved nutrients. The source of these nutrients is often agricultural or residential runoff.