Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm): [JEE Main 2020, 9 Jan (Shift 2)]

for the photochemical breakdown of waste present in \(1 \mathrm{~m}^3\) volume of a water body.

for sustaining life in a water body

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

by anaerobic bacteria to breakdown inorganic waste present in a water body