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
Disease completely eradicated from earth by vaccination is:
  • A
    anthrax
  • B
    small pox
    Correct
  • C
    plague
  • D
    amoebiasis
2
Malarial parasite attacks our:
  • A
    intestinal cells
  • B
    red blood cells
    Correct
  • C
    heart cells
  • D
    brain cells
3
The scientist who established that microbes can cause disease?
  • A
    Robert Brown
  • B
    Leeuwenhoek
  • C
    Louis Pasteur
  • D
    Robert Koch
    Correct
4
The organism which is non living outside living cell is :
  • A
    HIV
    Correct
  • B
    Clostridium
  • C
    yeast
  • D
    Plasmodium
5
Which of the following microbe contain more than one cell?
  • A
    slipper animalcule
  • B
    baker
  • C
    tobacco mosaic virus
  • D
    bread mould
    Correct
6
That group of microbes who can synthesize their own food?
  • A
    plasmodium
  • B
    fungi
  • C
    viruses
  • D
    algae
    Correct
7
If denitrifying bacteria are removed from earth which element will get reduced in air?
  • A
    carbon
  • B
    oxygen
  • C
    phosphorus
  • D
    nitrogen
    Correct
8
Yeast catalyses conversion of sugar into :
  • A
    alcohol and Carbon dioxide
    Correct
  • B
    citric acid and Carbon dioxide
  • C
    lactic acid and Carbon dioxide
  • D
    CO2 and penicillin
9
Avoiding infection by eliminating microbes from the surroundings is called:
  • A
    fermentation
  • B
    vaccination
  • C
    none of these
  • D
    hygiene
    Correct
10
We should not keep food in open because :
  • A
    all of these
  • B
    it will change the type of nutrients in food
  • C
    it will cause food spoilage
    Correct
  • D
    food will produce biogas
11
What Leeuwenhoek observed under microscope were :
  • A
    algae & protozoa
  • B
    fungi & viruses
  • C
    bacteria & protozoa
    Correct
  • D
    fungi & bacteria
12
Viruses belong to _____ of living world.
  • A
    animalia kingdom
  • B
    viralia kingdom
  • C
    plantae kingdom
  • D
    none of the kingdoms
    Correct
13
Read the following statements :i) Bacteria are unicellular organisms.ii) Bacteria lack cell membrane but contain a cell wall.
  • A
    Statement i) is correct but ii) is wrong.
    Correct
  • B
    both are wrong
  • C
    both are correct
  • D
    Statement ii) is correct but i) is wrong.
14
Freezing ensures food preservation because :
  • A
    changes water inside food into ice
    Correct
  • B
    changes nutrients inside food
  • C
    changes microbial flora inside food
  • D
    kills microbes and its all spores
15
Which instrument is required to view viruses?
  • A
    simple microscope
  • B
    electron microscope
    Correct
  • C
    hand lens
  • D
    compound microscope