Question

8) Write 10 lines on the usefulness of microorganisms in our
lives -
(4) Write short note on : Nitrogen cycle
(2)​

Answer 1

Answer:

Explanation:

A . Microorganisms are useful in our lives in the following ways :

(i) 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,

Answer 2

(1) Bacteria present in our intestine help in proper digestion.

(2) Yeast is used in making idli,bhature ,bread pastries and cake.

(3) Certain microorganisms are also used in the biological treatment.

(4) Many vaccines are prepared from microorganisms.

(5) Microorganisms are also used in winemaking,backing, pickling etc.