Given below are two statements:
Statement I: Possibility of oxygen depletion is high in running and turbulent water bodies.
Statement II: Oxygen is added to water by photosynthesis of green plants, algae and cyanobacteria.
In the light of the above statements, choose the most appropriate answer from the options
Statement I is incorrect but statement II is correct.
Let us evaluate each statement individually.
Statement I is incorrect. Running and turbulent water bodies, such as fast-flowing streams, rivers with rapids, or waterfalls, are actually well-aerated because the constant mixing, splashing, and agitation of the water increases its contact with atmospheric air, allowing more oxygen to dissolve into it. Oxygen depletion is a much greater concern in stagnant or still water bodies, such as ponds, lakes, or stagnant pools, especially eutrophic ones with a heavy organic load, where there is little mixing with air and oxygen consumption by decomposers can quickly exceed the oxygen supply.
Statement II is correct. Aquatic green plants, algae, and cyanobacteria (blue-green algae) carry out photosynthesis, during which they take in carbon dioxide and release oxygen as a byproduct, directly enriching the dissolved oxygen content of the water body.
Since Statement I is incorrect and Statement II is correct, the right conclusion is Statement I is incorrect but Statement II is correct.
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Statement II : Nonpoint sources of water pollution may be fairly uniform and predictable throughout the year.
In the light of the above statements, choose the correct answer from the options given below :
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________ is reducing the degree or intensity of, or eliminating, pollution.
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“Green Muffler” is related to:
