Correct option is A
Natural Organic Matter (NOM):
Natural organic matter (NOM) is an extremely complex mixture of organic compounds that vary greatly in terms of their physical and chemical characteristics.
NOM occurs naturally in the environment and may also be the result of human activities.
Chemical Effervescence:
Effervescence is the formation of bubbles of gas in a liquid due to a chemical reaction.
Biochemical Matter:
The biochemical matter is defined as matter (or material) that is produced by living things due to chemical reactions.
Biological Load:
Biological load defined as the total biodegradable organic matter (material) present in a water sample is called the biological load.
