Answer: True
Eutrophication is a natural phenomena which occur in a water body due to surface runoff. The water from the terrestrial land surface takes away and deposits sediments containing minerals into the water body such as river, lakes and ponds. The excess of minerals in these sediments promote the growth of large amount of aquatic plants and algae. This contaminates the quality of water and depletes the oxygen availability of the water. This results in the mortality of large number of aquatic animals.
It disrupts the balance of ecosystem because eutrophication promotes the increase in the aquatic plants which are producers. But it results in the decline of the number of aquatic animals which are consumers. Hence, the balance of ecosystem is disturbed.