CBSE  /  Class 8  /  Science  /  Microorganisms: Friend and Foe

  • 1. 
    like polio and chicken pox are caused by _______

  • Bacteria
  • Fungi
  • Virus
  • Worms

  • 2. 
    Examples of Multicellular Microorganism are

  • 3. 
    Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ______.

  • Antibodies
  • Antibiotics
  • Antiseptics
  • All of the above

  • 4. 
    A common preservative used in jam and pickles is

  • Sodium benzoate
  • Nitric acid
  • Sodium Chloride
  • Copper Sulphate

  • 5. 
    Rhizobium found in root nodules of leguminous roots is an

  • Atmospheric Carbon fixer
  • Atmospheric Oxygen fixer
  • Atmospheric Nitrogen fixer
  • All of the above

  • 6. 
    Lactobacillus is commonly found in

  • Cake
  • Curd
  • Bread
  • All of the above

  • 7. 
    The process of conversion of sugar into alcohol by yeast is called

  • Fermentation
  • Pasteurisation
  • Alcoholism
  • All of the above

  • 8. 
    The pores in the bread is due to gas bubbles of

  • Oxygen
  • Nitrogen di oxide
  • Nitrogen
  • Carbon di oxide

  • 9. 
    Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______

  • Medication
  • Antibiotics
  • Vaccination
  • All of the above

  • 10. 
    The microbe for Malaria is carried by

  • Male Anopheles mosquito
  • Female Anopheles Mosquito
  • Male Aedes mosquito
  • Female Aedes mosquito
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