EARTH SCIENCE
GROUNDWATER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increasing the amount of nutrients available to fish in lakes and streams.
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clogging narrow streams and preventing water from flowing properly.
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raising the water level in nearby rivers to levels leading to flooding.
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causing rapid algal growth that decrease oxygen levels and choke aquatic life.
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Detailed explanation-1: -This generally takes place when the fertilizers used in fields get washed in the water body. A common effect of eutrophication is algal blooms. The emergence of algal blooms results in the depletion of oxygen of the water body resulting in the choking of aquatic life. Thus, the correct answer is option C.
Detailed explanation-2: -When fertilizers enter surface water, they cause problems in the watershed by-clogging narrow streams and preventing water from flowing properly.
Detailed explanation-3: -When manure or commercial fertilizers enter surface water, the nutrients they release stimulate microorganism growth. The growth and reproduction of microorganisms reduce the dissolved oxygen content of the water body. Without sufficient dissolved oxygen in surface water, fish and other aquatic species suffocate.
Detailed explanation-4: -Too much nitrogen and phosphorus in the water causes algae to grow faster than ecosystems can handle. Significant increases in algae harm water quality, food resources and habitats, and decrease the oxygen that fish and other aquatic life need to survive.
Detailed explanation-5: -It creates dead zones: As algae blooms, it can deplete the water of its natural oxygen. This lack of oxygen can lead to a “dead zone, ” or an area where aquatic plants and animals cannot survive. It is not safe to drink: Some lakes supply drinking water for millions of people.