This video lecture from Man and His Environment (F.Sc. second year Biology) covers information about water pollution, acid rain and effects of fertilizers, pesticides and insecticides on ecosystem.It also include details about eutrophication (algal bloom) and their effects on fresh water ecosystem. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab