Question

Eutrophication is often seen in
A. Mountains
B. Deserts
C. Freshwater lakes
D. Oceans

Answer 1

Hint: Eutrophication is the natural aging of a lake by nutrient enrichment of its water. It is a biological process which continues according to the time .

Complete answer:In young lakes the water is cold and clear supporting little life with times streams draining into the lake introduce nutrients such as nitrogen and phosphorus which encourages the growth of aquatic organisms .
And the lake's fertility increases , plant and animal like burgeons , and organic remains begin to be deposited on the lake bottom .
Over the centuries , as silt and organic debris pile up the lake grows shallower and warmer with warm water organisms supplanting those that thrive in a cold environment .
Marsh plants take roots in the shallows and begin to fill in the original lake basin . Eventually the lake gives way to large masses of floating plants known as blogs, finally converting into land . Depending on climate , size of lake and other factors the natural aging or eutrophication of a lake may span thousands of years .
So , Eutrophication is often seen in freshwater lakes .
So the correct answer is ( C ).

Additional Information:Nowadays pollutants from man activities like effluents from the industries and homes can radially accelerate the aging process . This phenomenon has been called cultural or accelerated eutrophication .
During the past century , lakes in many parts of the earth have been severely eutrophied by sewage and agricultural and industrial wastes

Note: Thermal waste water eliminates or reduces the number of organisms sensitive to high temperature and may enhance the growth of plants and fish in extremely cold areas but only after causing damage to indigenous flora and fauna .