(C) Biochemical oxygen demand $(BOD)$ is defined as the amount of dissolved oxygen required by aerobic bacteria to break down the organic matter prese

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by bacteria to break-down organic waste in a certain volume of a water sample.

(C) Biochemical oxygen demand $(BOD)$ is defined as the amount of dissolved oxygen required by aerobic bacteria to break down the organic matter present in a certain volume of a water sample at a specific temperature over a period of $5$ days.

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

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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.