Correct option is D
(a) Usually less than COD:
· BOD (Biochemical Oxygen Demand) is usually less than COD (Chemical Oxygen Demand) because COD measures the total quantity of oxygen required to oxidize both biodegradable and non-biodegradable organic matter, while BOD measures only the oxygen required to oxidize biodegradable organic matter.
(b) A measure of the organic matter present in wastewater:
· BOD is a measure of the amount of oxygen required by microorganisms to break down organic matter in water over a specific period, typically 5 days. It indicates the level of organic pollution in the water.
(c) Biochemical oxygen demand:
· BOD stands for Biochemical Oxygen Demand, which is a standard measure in environmental science used to assess the organic pollution of water bodies.
All the given statements are correct about BOD, making (d) All of the options the correct answer.
