Question

Write 10 lines on the usefulness of microorganisms in our lives.

NCERT Class VIII
Science - Main Course Book

Chapter 2. Microorganisms: Friend and Foe

Answer 1

The 10 lines on the usefulness of microorganisms are:-

1) It  is used in the commertial manufacturing of alcohol and acetone.

2) Some bacteria are used to obtain medicines like antibiotics, serums and vaccines.

3) certain microorganisms have a key role in agriculture.

4)They are responsible for nitrification, i.e, The process of conversion of ammonia to nitrates.

5) Some microorganisms stay in the intestine of living beings and helps them in digestion.

6)microorganisms like yeast are used in the formation of cake, bread, cheese, etc.

7)They act as the cleansing agent of our ecosystem.

8)Yeasts are nutritional supplement as they contain vitamin b and e.

9)The lactobacillus bacteria, is used for the manufacturing of curd from milk.

10)They are used for the curing and ripening of tea and tobacco leaves to develop characteristic aroma and flavour.

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Answer 2

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Uses of microorganisms:

(i) Microorganisms help in the preparation of curd, bread, cake etc.

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

(iii) Yeast is used to prepare vinegar.

(iv) Microorganisms are used to make wines.

(v) They act as cleaning agent and decompose the waste products into manure.

(vi) They destroy the plant and animal dead bodies by decomposing them.

(vii) They increase soil fertility by fixing nitrogen of atmosphere.

(viii) They are used in making medicines like antibiotics and vaccines.

(ix) They are used as preservatives for food items.

(x) They help in various metabolic activities in our body.

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