Class VIII

The common chemicals generally used to check the growth of microorganisms are known as ...
  1. antibiotics
  2. Preservatives
  3. antigens
  4. pathogens
Which of the following is not a communicable disease?
  1. Cholera
  2. Chicken pox
  3. Tuberculosis
  4. Malaria
The process of conversion of sugar into alcohol is known as ...
  1. Budding
  2. Fusion
  3. Fermentation
  4. Fixation
What does our body produces to fight the invader when a diseasecarrying microbe enters our body?
  1. Antigens
  2. Antibodies
  3. Pathogens
  4. Antibiotics
Which of the following bacteria is involved in the fixation of nitrogen in leguminous plants?
  1. Rod-shaped bacteria
  2. Spiral bacteria
  3. Rhizobium
  4. Spherical bacteria
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