Praxis II: Chemistry Exam Prep

Category - General Chemistry

Which of the following is one cause of eutrophication in aquatic ecosystems?
  1. An increase in the amount of acid precipitation.
  2. An increase in the concentration of heavy metals
  3. An overabundance of nitrogen-containing compounds.
  4. An overabundance of dissolved oxygen
Explanation
Correct Response: C. Eutrophication is a process in which the introduction of excessive nutrients into an aquatic system leads to excessive plant and algae growth. Agricultural fertilizers or other nitrogen-rich chemicals are often a source of the excess nutrients. When the plants and algae die, they are decomposed by aerobic organisms that reduce the oxygen levels in the aquatic system. A is incorrect because acid rain is not involved in eutrophication. In fact, acid rain would hinder plant and algae growth rather than promote it. B is incorrect because heavy metals can be detrimental to plants and algae. D is incorrect because eutrophication results in a shortage in the supply of oxygen in the aquatic system.
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