Biochemical Oxygen Demand $(BOD)$ is the amount of oxygen required (in $ppm$):

  • A
    by anaerobic bacteria to breakdown inorganic waste present in a water body.
  • B
    for the photochemical breakdown of waste present in $1 \; m^{3}$ volume of a water body.
  • C
    by bacteria to break-down organic waste in a certain volume of a water sample.
  • D
    for sustaining life in a water body.

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