{:(,"Column A",,,"Column B"),(A.,"Defecation by living being","()",a.,"Arsenic, mercury etc"),(B.,"Industrial operation","()",b.,"Intesecticides, fungicides etc"),(C.,"Thermal pollution","()",c.,"Amoeba, fungicides etc"),(D.,"Agricultural activities","()",d.,"Favourable for growth of algae"):}

{:(,"Column A",,,"Column B"),(A.,"Defecation by living being","()",a.,

1.	{:(,"Column A",,,"Column B"),(A.,"Defecation by living being","()",a.,"Arsenic, mercury etc"),(B.,"Industrial operation","()",b.,"Intesecticides, fungicides etc"),(C.,"Thermal pollution","()",c.,"Amoeba, fungicides etc"),(D.,"Agricultural activities","()",d.,"Favourable for growth of algae"):}
Answer» Solution :Defecation by living beings produces pollutants such as amoeba, fungicides etc. Industrial operation produces pollutants such as MERCURY, ARSENIC etc. Water RELEASED from THERMAL POWER plants is favourable for growth of alge. Agricultural activities produces pollutants such as intesecticides, fungicides etc.