Question

Give two ways in which bacteria are useful to us and two ways in which they are harmful?

Answer 1

advantages of bacteria
1.bacteria are the only organism which can fix nitrogen in atmosphere .
2.bacteria are the major class of decomposers

disadvantages of bacteria are
1.bacteria cause diseases and infections
3.bacteria infection can break down skins and organs

Answer 2

Explanation:

Digestion is helped in by bacteria E. coli, Nitrogen is converted in by Rhizobium and antibiotics can be made by Streptomyces. Bacteria can cause harmful diseases like pneumonia or meningitis. They can also cause food poisoning by contaminating the food by their presence.