Respuesta :
The answer is A. Oligotrophic lakes are clear and hence have little vegetation in them (hence no net primary production) that could initiate the process of eutrophication. Eutrophication is brought about when bacteria break down the high amount of organic matter hence reduce the oxygen supply in the waters.
The oxygen sag curve is related to all of the following except oligotrophic lakes.
Further Explanation:
Oxygen sag curve is obtained when the amount of the dissolved oxygen inside a river in which pollutant and sewage is released is plotted against distance downstream from a sewage pipe. In this small amount of water is taken from downstream and upstream areas from sewage outlet. The occurrence of sewage in water reduces the content of the oxygen into the water and increases the BOD. It is referred as biochemical oxygen demand. This develops due the activity of saprotrophic organism that mainly decomposes the organic substances of the sewage.
Oligotrophic lakes are clear and hence have little vegetation in them. Hence, there is no net primary production that could initiate the process of eutrophication. Eutrophication is a process which initiate when the bacteria break downs the very high amount of organic substances and reduces the oxygen supply in the water.
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Answer Details:
Grade: High School
Subject: Biology
Topic: Oxygen sag curve
Keywords:
Oxygen sag curve, reduce, supply, substance, eutrophication, organic substance, water, lakes, downstream, upstream, biochemical oxygen demand.
