Discussion
Microorganisms can be both useful as well as harmful to us. Which of the following beneficial processes is not carried out by microorganisms?
Answer: C
The process not carried out by microorganisms is Preservation of food items in homes.
Food preservation in homes, by salting, adding sugar or oil, pickling, refrigeration or heating, works by preventing the growth of microorganisms, because microbes are what spoil food. So preservation is protection against microorganisms, not something they do.
Microorganisms do the other three. Bacteria and fungi decompose organic wastes. Nitrogen-fixing bacteria and blue-green algae increase soil fertility. Antibiotics such as penicillin and streptomycin, and many vaccines, are made with the help of microorganisms.
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