Question

give two ways in which bacteria are useful to us and two ways in which they are harmful
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Answer 1

Answer:

bacteria are useful in curdling of milk and preparing vaccines and harmful in causing diseases and spoilage of food items

Answer 2

Answer:

uses of bacteria:

1. lactobacillus bacteria is used for making curd from milk.

2. rhizobium bacteria helps in the nitrogen fixation , that helps in the replenishment of nitrogen.

#.. harmful effects of bacteria:

1. they cause many disease like TB, Typhoid, etc

2. they cause the spoilage of food.