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Q.

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 m3 volume of a water body

c

for sustaining life in a water body

d

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

answer is D.

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Detailed Solution

Organic waste utilise oxygen and convert to they simplest form, by the Definition of biological oxygen demand [BOD].
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Biochemical Oxygen Demand (BOD) is the amount of oxygen required( in ppm):