Class VIII

Who discovered the vaccine for small pox ? 
  1. Louis Pasteur 
  2. Alexander Fleming 
  3. Joseph Lister 
  4. Edward Jenner 
Diseases like dysentery and malaria are caused by _____?
  1. Protozoa
  2. Fresh water
  3. Food
  4. None of these
Which of the following disease cannot be prevented by vaccination?
  1. Hepatitis A
  2. Malaria
  3. Measles
  4. Cholera
_____ are even mixed with the feed of live stock and poultry to check microbial infection in animals.
  1. Antibiotics
  2. Sugar
  3. Virus
  4. None of these
Microorganisms are
  1. Unicellular
  2. Multi-cellular
  3. Both
  4. None of these
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