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  4. Ecology And Environment

SSC Ecology And Environment Sample Paper NCERT Sample Paper-3

  • question_answer
    With reference to Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), consider the following statements:
    1. BOD is a measurement of consumed oxygen by aquatic microorganisms to decompose organic matter.
    2. COD refers to the requirement of dissolved oxygen for the oxidation of organic constituents.
    Which of the statements given above is/are correct?

    A)  1 only 

    B)  2 only

    C)  Both 1 and 2    

    D)  neither 1 nor 2

    Correct Answer: A

    Solution :

    [a] BOD is only a measurement of consumed oxygen by aquatic microorganisms to decompose or oxidize organic matter. However, COD refers the requirement of dissolved oxygen for the oxidation of organic and inorganic constituents both.


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