Question

Give reason why bacteria are regarded as our foes and friends

Answer 1

Answer:

Explanation:

Bacyerias are friend because :

They help us for preparing some antibiotics

They help us in making of some kind of sour substances such as curd

Some bacteria decompose the bio waste to manure they help in making clean environment

Bacteria are a for because some of bacteria cause damage to human beings

Some of them cause very dangerous disease

Some of them cause damage to plants and animals also

So, bacteria can be friend and for both thanks

Answer 2

Explanation:

As friends:

1) Nitrogen fixing bacteria help in plant growth

2) Lactobacillus in curd formation

3) Yeast in fermentation process and in bakeries

As for:

1) Lactobacillus acidophilus in our mouth degenerate dental enamel

2) bacteria cause many diseases

e.g. Salmonella typhi