CBSE Class 8 – Science – Microorganisms – Friends or Foes (Worksheet) (#cbseNotes)

Microorganisms – Friends or Foes (Worksheet)

Fill in the blanks 

1. Study of Microorganisms :  __________________


2. The size of bacterium is 3.5 microns =   ___________  mm       =         ___________ m


3. Microbes are divided into four categories:
i. _____________ ii. _____________
iii. _____________ iv. _____________


4. Viruses live on __________ line of living and non-living. They do not own _______ apparatus. They enter the body of living cell and start ___________.


5. The living cell inside which the virus grows and multiplies is known as ________.


6. Study of viruses is called ___________.




7. Father of Microbiology ____________.


8. The study of bacteria is called ____________.


9. A virus that infects and replicates in a bacterium is called ____________.


10. The curd contains __________ bacteria which helps to change the milk into curd.


11. Four types of bacteria are recognised based on shape:

i.   S______   shaped

        ii. R____ shaped

iii.  S_______ shaped

        iv. C____ shaped


12. The conversion of sugar solution into alcohol and liberation of carbon dioxide is called _________.


13.  Study of fungi is called _________.


14. Fungi are_______ of photosynthesis.  (capable/ incapable)


15. Antimicrobial agents which are useful medicines or drugs and are called __________.
Examples are: ________, ___________and  __________


16. A_____ F______ of Britain in 1929 discovered the ‘Wonder Drug’ called  _________.


17. Rhizobium are Azatobactor are ________-fixing bacteria. They live ________ nodules of ________ plants.


18. _________ is the best source of vitamin B complex and vitamin Riboflavin. It is a ______.


19. Edible fungi are: ___________.


20. Citrus Canker, a plant disease, is caused by ___________.


21. Blast disease of rice, a plant disease, is caused by ___________.


22. Tobacco Mosaic disease, a plant disease, is caused by ___________.


23. Virus causing diseases are: _________________________________.


24. Bacteria causing diseases are: ______________________________


25. Fungal diseases are: ___________________________________


26. Diseases caused by protozoa are: ___________________________


27. Milk is heated to 72°C for 30 minutes and then suddenly cooled to 12°C. Microbes are killed without causing damage to the taste and quality of milk. Name this process: ____________

☛See also

Ch 2 - Micro-organisms - Friend and Foe (Q & A)
Ch2 - Micro-Organisms - Friend and Foe (MCQs)
Ch 2 - Micro-organisms  - Friends and Foes (Textbook Answers)
Ch 2 - Microorganisms - Friends and Foes (Q & A 2)