Bacteria are useful as well as harmful to us. Explain it by giving some examples
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Dear student,
Please find below the answer:

Bacteria are useful as well as harmful for us. This can be explained using the following examples:

Harmfulness of bacteria:   
Bacteria cause the rotting of vegetables and fruits.
Bacteria cause food poisoning.
Bacteria cause loss of productivity of the soil.
Bacteria are responsible for over 90% of human and animal diseases. For example, Mycobacterium tuberculosis, Salmonella typhi, etc. 

Usefulness of bacteria:  
Bacteria cause the decomposition of dead bodies.
Sewage is broken down by bacteria.
Bacteria convert dung, farm refuses into manure.
A number of antibiotics are obtained from bacteria. For example, Streptomycin is obtained from the bacteria Streptomyces griseus
Bacteria play a very important role in the dairy industry. For example, Lactobacillus help in converting milk to curd. 

Hope this clears your doubt.
Regards.
 

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