Eutrophication is the result of water pollution by excessive use of pesticides and fertilizers. Pesticides and Fertilizers are discharged into water bodies from nearby agricultural land.Pesticides can affect the nervous system and fertilizers help in the fast growth of aquatic weeds. By this,a thick layer of algae will form and the water becomes bad in smell and taste. This happens because the layer of algae prevents the entrance for sunlight for photosynthesis of aquatic plants and because of defficiency of oxygen marine life dies