Choose and write the correct answer (MCQs) :

1. Antibiotics like chloromycetin, streptomycin and aureomycin are obtained from:
   1. fungi
   2. bacteria
   3. virus
   4. protozoa
2. 'Citurs canker' which is plant disease caused by :
   1. fungi
   2. virus
   3. bacteria
   4. algae
3. Yeast is used in the production of :
   1. alcohol and wine
   2. sweets
   3. curd 
   4. pickle
4. ____________ is the chief source for producing nitrogenous.
   1. hydrogen
   2. water 
   3. oxygen
   4. ammonia
5. _____________ act on dead bodies of plants and animals.
   1. bacteria
   2. algae
   3. virus
   4. fungi

Fill in the blanks.

1. To sea Micro-organisms we require a special device called __________.
2. Generally Micro-organisms are ____________ called.
3. ___________ is used to make bread, pastries and cake.
4. Penicillin is obtained from the fungus ___________.
5. Some bacteria and blue green algae are able to fix _________ from the atmosphere.
6. Diseases like common cold, rabies, chicken pox and polio are caused by ___________.
7. Cholera is caused by ___________ bacterium.
8. Robert Koch discovered the bacterium (Bacillus anthracis) which causes ____________ disease.
9. Common salt is used to preserve ___________ and ___________ for long.
10. We can consume ___________ milk without boiling.

Write T for true or F for false :

1. Micro-organisms can survive in almost all kinds of environments.
2. Micro-organisms play an important roles in human life.
3. The process of conversion of sugar into alcohol is known as pasteurisation.
4. Yeast is used in the preparation of Vitamin D.
5. Common cold is caused by virus.
6. Diseases like cholera, tuberculosis and typhoid are caused by protozoans.
7. Diarrhoea and gastroenteritis are intestinal disorders.

What do you understand by Micro-organisms? Describes their useful and harmful effects.

Write commercial and medicinal use of Micro-organisms?