Jill takes her children to play in the park every afternoon. she notices that since the city changed their landscaping service, the pond in the center of the park is now covered with algae. what is the most probable cause? a) too much rain b) not enough rain c) excessive application of fertilizer d) insufficient application of fertilizer

The correct answer is (c) excessive application of fertilizer.

The term associated with the formation of algal bloom in pond due to excessive application of fertilizer is called as Eutrophication. The excessive amount of nitrogen and phosphorous in fertilizers helps in excessive growth of algal bloom which makes the pond look green.The fertilizers used in agriculture comes by run-off and gets mixed in the pond, supporting the growth of algae.

Hence, excessive application of fertilizers enhances the growth of algae which appears green in color.