What is the full form of NBOD?

Correct option is D

The full form of NBOD is Nitrogenous Biochemical Oxygen Demand. It refers to the amount of oxygen required by microorganisms to break down the nitrogenous organic matter present in water, like proteins and amino acids. This is distinct from CBOD (Carbonaceous Biochemical Oxygen Demand), which measures the amount of oxygen required to break down carbon-based organic matter. NBOD is a specific component of the overall BOD (Biochemical Oxygen Demand), an important parameter in assessing water quality and pollution levels.