SSC Ecology And Environment Sample Paper NCERT Sample Paper-2

  • question_answer
    If BOD of a river is high, it means that the river

    A)  Is not polluted

    B)  Is very polluted

    C)  Does not have green plants

    D)  Get least amount of light

    Correct Answer: B

    Solution :

    [b] Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at \[20{}^\circ C\] and is often used as a surrogate of the degree of organic pollution of water.

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