class 8 worksheet on microorganism

                                   Chapter 2 WORKSHEET-2
A. Tick  the correct option.
1. The study of micro-organisms is known as:
a. Psychology b. Physiology
c. Microbiology d. Zoology
2. Which bacteria changes nitrogen of air into nitrate?
a. Bacillus b. Coccus
c. Spirillum d. Rhizobium
3. The micro-organism which is used in the manufacture of alcohol, wines, etc.
a. Bacteria b. Fungi
c. Algae d. Protozoa
4. Which of the following statement is not true about micro-organisms?
a. They feed and grow
b. They reproduce
c. They are found everywhere
d. They all are harmful
5. Which gas is produced due to fermentation of sugar by yeast cells?
a. Carbon dioxide b. Nitrogen
c. Oxygen d. Hydrogen
B. Match the following and write down the number of correct pairs.
a. Lactobacillus     i. Unicellular _____________
b. Protozoa            ii. Cilia _____________________
c. AIDS                iii. Fungi _____________________
d. Paramoecium   iv. Virus _____________________
e. Athlete’s foot   v. Bacteria _____________________

C. Use the clues to fill in the blanks:
a. Micro-organism which is on the border-line between living and non-living __________________
b. Disease causing micro-organisms ____________
c. Dr. Alexander Fleming discovered ____________
d. Malaria causing micro-organism ____________
e. Diseases caused by micro-organisms can be prevented by ____________
D. Name the micro-organisms responsible for these diseases:
Diseases                       Micro-organisms
a. Diarrhoea       ______________
b. Polio              ______________
c. Malaria          ______________
d. Typhoid        ______________
e. Ring worm  _______________

E. Identify the given micro-organism.Write one characteristic feature for each.
(a) (b) _________


(c)                     
                                          (d)_______________
 (e) ________