Ncert Exercises & Solutions

BOD of waste water is estimated by measuring the amount of

1. total organic matter

2. biodegradable organic matter

3. oxygen evolution

4. oxygen consumption

(d) BOD (Biochemical Oxygen Demand) refers to the amount of the oxygen that would be

consumed if all the organic matter in one litre of water were oxidised by bacteria

Other options (a) (b) and (c) are incorrect.

Page 184, XII NCERT