Question

Discuss three important ways in which bacteria are useful to us and two ways in which they are harmful...
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Answer 1

Useful ways are-

1)Bacteria helps us in making curd.Curd contains the bacterium lactobacillus.

2)Bacteria are used to make some

medicines.

3)Bacteria are also used to make vaccines and antibiotics

Harmful ways are-

1)Bacteria can grow on our foodstuffs and spoil them.

2)Bacteria causes food poisoning

Answer 2

Answer:

Bacteria is useful as well as harmful.

Explanation:

They are useful to us by:

Making curd and cheese.

Making bread.

Making alcoholic drinks.

Cleaning the Environment and etc.

They are harmful to us by:

Causing dieases.

Bacteria spoiling food. And consuming spoil food causes food poisoning.