Bio-Magnification Also Knownas Bio-Amplification Or Biological Magnification Occurs When the Concentration Of a Substance, Suchas Ddt Ormercury, In an Organism Exceeds the Backgroundconcentration of the Substance In Its Diet. This Increase Can Occur As Aresult Of: Persistence – Where the Substance Can't Be Broken Down By Environmentalprocesses. Food Chain Energetics –Where the Substance Concentration Increases Progressively As It Moves Up a Foodchain. Low or Non-Existent Rate of Internal Degradation or Excretion of Thesubstance – Often Due to Water-Insolubility.