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12th Class Biology Sample Paper Biology - Sample Paper-1

  • question_answer
    What is BOD? What does it mean if a water sample has more BOD?

    Answer:

    BOD means the biochemical oxygen demand which represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litre of water were oxidised by microorganisms.                            
    More value of BOD means the water sample is polluted by organic matter.                                                 


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