Question

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

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

Answer 1

The correct option is B by bacteria to break-down organic waste in a certain volume of a water sample.

The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand (BOD).
So, option B is correct.