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Bio chemica oxygen demand dissolve oxygen by aerobic organisms in water  break down of organic materials
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BOD is the Biological Oxygen Demand which is the amount of dissolved oxygen required by aerobic bacteria in a body of water to break down organic material present in it. 
It shows how polluted a water body is. If the BOD is high, then it is more polluted.....if BOD is less, then it is less polluted...
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