Holt Modern Biology 1st Edition by John Postlethwait ,Janet Hopson

Exercise 14

A scientist wants to examine the effect of fertilizer on algal blooms. In the laboratory, the scientist adds increasing amounts of fertilizer to three samples of pond water and adds no fertilizer to a fourth sample of pond water.
Part A Which samples will show increasing algal growth? Explain your answer.
Part B How can the scientist apply his or her laboratory results to a natural ecosystem? Compare the scientist's experiment to a natural ecosystem, such as a pond.