Class 8 Microorganisms Friend And Foe CBSE Questions & Answers

Class 8 · Microorganisms Friend And Foe

This is Science Class 8 Microorganisms Friend And Foe CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Microbiology is the study of :
  • A
    useful products prepared from microbes
  • B
    diseases caused by microorganisms
  • C
    microbes
    Correct
  • D
    parts of living organisms
2
Leeuwenhoek observed in a drop of pond water :
  • A
    fungi
  • B
    living microorganisms
    Correct
  • C
    viruses
  • D
    dead cork cells
3
Pasteur discovered :
  • A
    fragmentation in spirogyra
  • B
    fermentation & dead cork cells
  • C
    binary fission in amoeba
  • D
    yeast budding & fermentation
    Correct
4
_____ are non cellular infectious particles.
  • A
    bacteria
  • B
    viruses
    Correct
  • C
    blue green algae
  • D
    protozoa
5
Iwanowski discovered virus from :
  • A
    okhra leaves
  • B
    tobacco leaves
    Correct
  • C
    betel leaves
  • D
    potato leaves
6
Organism responsible for amoebic dysentery is :
  • A
    Entamoeba histolytica
    Correct
  • B
    Entamoeba gingivalis
  • C
    Amoeba proteus
  • D
    Plasmodium vivax
7
The microorganism which helps in fermentation is :
  • A
    yeast
    Correct
  • B
    E. coli
  • C
    Rhizobium
  • D
    Rhizopus
8
Microorganisms are responsible for :
  • A
    free radical formation
  • B
    non biodegradation
  • C
    biodegradation
    Correct
  • D
    chemical control
9
Which two words are synonyms?
  • A
    microorganism and microbe
    Correct
  • B
    microorganism and pathogen
  • C
    microbe and aerobe
  • D
    microbe and anaerobe
10
Germ theory of disease was established by :
  • A
    Louis Pasteur
  • B
    Robert Hooke
  • C
    Robert Brown
  • D
    Robert Koch
    Correct
11
Scientists who study microorganisms are called?
  • A
    microtypist
  • B
    microorganists
  • C
    microscopists
  • D
    microbiologists
    Correct
12
Microorganisms live as :
  • A
    only solitary
  • B
    only colonies
  • C
    colonies & complex multicellular forms
  • D
    solitary & colonies
    Correct
13
Microorganisms are :
  • A
    hetrotrophs
  • B
    autotrophs
  • C
    saprophytes
  • D
    autotrophs & heterotrophs
    Correct
14
Protective covering that encloses microorganisms during unfavourable conditions:
  • A
    cyst
    Correct
  • B
    cell wall
  • C
    capsule
  • D
    test
15
Microorganism couldn
  • A
    microscope
    Correct
  • B
    stain
  • C
    microtech
  • D
    nanotech