Pools, Ponds, and Lakes

Question 8 • *GV 2019 - MPS Environmental Science Semester 2 SC631

Which of the following statements about eutrophication is true?

Answer

Eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent increase in the oxygen levels of the water.

Eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the water.

Eutrophication involves the overpopulation of aquatic ecosystems with plant and animal life.

Eutrophication is rarely caused by human activity.

Explanation

Excess nutrients can trigger rapid growth of algae and other aquatic plants. When this growth dies, decomposers break down the dead material and consume dissolved oxygen, causing oxygen levels in the water to decrease. Therefore, the true statement is that eutrophication increases plant growth and subsequently decreases oxygen levels.

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