Question

III llle sota
7.
8.
Write 10 lines on the usefulness of microorganisms in our lives.
Write a short paragraph on the harms caused by microorganisms​

Answer 1

Answer:

Microorganisms are very useful to us. They help us in following ways: 

(i)   Microorganisms help us in food sector. They are used for curdling of milk, preparation of bread, cake, etc. 

(ii)   Microorganisms are used to produce alcohol at large scale. 

(iii) They are also used to produce wine.

 (iv) Yeast is used in bakeries.

 (v)   They are also used as preservatives for food items.

 (vi) They are used to make different medicines, especially the antibiotics.

 (vii) Microorganisms are used to prepare vaccines for various diseases. 

(viii) They are useful for agriculture sector, as they enhance the fertility of soil by fixing nitrogen.

 (ix) They work as natural cleaners, as they decompose the dead bodies of plants and animals. 

(x)   Microorganisms prepare manures by decomposing dead bodies of plants and animals.

Answer 2

Bacteria cause the decay of dead plants and animals.

(ii) Nitrogen fixing bacteria convert the atmospheric nitrogen into nitrates.

(iii) Bacteria are used in the production of vinegar, curd, cheese, etc.

(iv) Bacteria are used in sewage disposal plants.

(v) Scientists have discovered ways to change bacteria so that they produce valuable medical,Microorganisms can prove very harmful to us, as they cause a number of diseases in human, plants and animals. ... Some serious diseases like anthrax is also caused in animals by the microbes. Microbes also cause diseases of plants like blights in potatoes, sugarcanes, oranges etc.