Thursday, April 11, 2013

CBSE Class 8: Science - CH2 : Micro-Organisms - Friend and Foe (MCQs)

Micro- Organisms - Friend and Foe
Microbes: Party in Intestine
credits: openclipart


Q1: The process of conversion of sugar into alcohol is known as  ...

(a) Budding
(b) Fusion
(c) Fermentation
(d) Fixation

Q2: What does our body produces to fight the invader when a disease-carrying microbe enters our body?

(a)  Antigens
(b)  Antibodies
(c)  Pathogens
(d)  Antibiotics

Q3: Who discovered Fermentation?

(a)  Edward Jenner
(b)  Alexander Fleming
(c)  Louis Pasteur
(d)  Selman Waksman

Q4: Which of the following is not a communicable disease?

(a) Cholera
(b) Chicken pox
(c) Tuberculosis
(d) Malaria

Q5: Chicken Pox is caused by

(a)  Virus
(b)   Bacteria
(c)   Fungus
(d)   Protozoa

Q6: The common chemicals generally used to check the growth of microorganisms are known as ...

(a)  antibiotics
(b)  Preservatives
(c)  antigens
(d)  pathogens

Q7: The microorganisms that cause diseases in human beings, plants and animals are called ____

(a)  Carriers
(b)  Spirogyra
(c)  Pathogens
(d)  Antibodies

Q8:  Who discovered the vaccine for small pox?

(a)  Louis Pasteur
(b)  Alexander Fleming
(c)  Joseph Lister
(d)  Edward Jenner

Q9: Which of the following microorganism promotes the formation of curd?

(a)  Lactobacillus
(b)  Amoeba
(c)  Spiral bacteria
(d)  Spirogyra

Q10:  Which of the following bacteria is involved in the fixation of nitrogen in leguminous plants?

(a)  Rod-shaped bacteria
(b)  Spiral bacteria
(c)  Rhizobium
(d)  Spherical bacteria

1: (c) Fermentation
2: (b)  Antibodies
3: (c)  Louis Pasteur
4: (d) Malaria
5: (a) Virus
6: (b)  Preservatives
7: (c)  Pathogens
8: (d)  Edward Jenner
9: (a)  Lactobacillus
10:  (c)  Rhizobium

4: (c)  Louis Pasteur


  1. Replies
    1. This comment has been removed by the author.

    2. malaria is not a communicable disease?🤓

  2. fermentation was discovered by louis pasteur, not by alexander fleming.
    hehehe !

    1. Nope it was actually seen first n cork cells by Alexander Fleming

    2. Fermentation was discovered by Alexander Flemming

  3. really amazing . thanks to the developers of the page. this helped me a lot for
    aakash talent hunt . wish me best of luck !! :-)

  4. This comment has been removed by the author.

  5. This was very useful before an examination for my daughter. I hope everyone will like this

  6. And Louis Pasteur discovered the vaccine for small pox

  7. Come on guys let’s write the FIITJEE Big Bang Edge Test toghether on 15th oct 2017