Question

Eutrophication of the water body occurs due to addition of.
A. Detergents
B. Fertilisers
C. Sewage
D. All of the above.

Answer 1

Hint:The most common nutrients causing eutrophication are nitrogen and phosphorus. The major source of nitrogen pollutants is run-off from agricultural land, whereas most phosphorus pollution comes from households and industry.

Complete answer:
To answer this question, first, we need to know about eutrophication. Eutrophication is specified by immoderate plant and algal growth because of increased availability of one or multiple limiting growth factors required for photosynthesis, like carbon dioxide, sunlight and nutrient fertilizers. Eutrophication develops naturally over thousand years as lakes age and are filled in with sediments. The most conspicuous effect of cultural eutrophication is the creation of dense blooms of noxious, foul-smelling phytoplankton that reduce water clarity and harm water quality.
Now, let us find the solution from the option.
Eutrophication is caused by minerals such as Phosphorus and Nitrogen which reach natural water bodies via seeped fertilizers, insecticides, detergents, sewage and other effluents. These provide a substrate for algal growth and subsequent Eutrophication.

Thus, the correct option is D .i.e, All of the above.

Note:Human activities also increased the range and extent of eutrophication via both point-source releases and non-point loadings of limiting nutrients like phosphorus and nitrogen into aquatic ecosystems, with considerable conditions for fisheries, drinking water sources and newly recreated water bodies. As an example, aquaculture scientists and pond managers frequently eutrophic water bodies by adding up fertilizers to increase primary capacity and increase the density and biomass of economically important fishes through below effects on advanced trophic levels.