CBSE  /  Class 12  /  Biology  /  Microbes in Human Welfare

  • 1. 
    Streptomycin is produced by:

  • By Streptomyces Scoleus
  • By Streptomyces fradiae
  • By Streptomyces venezueleae
  • By Streptomyces griseus

  • 2. 
    Antibiotics are:

  • Medicines
  • Toxin
  • Plants
  • Syrups

  • 3. 
    A free-living aerobic and non-photosynthetic nitrogen fixing bacterium is:

  • Anabaena
  • Clostridium
  • Azotobactor
  • Rhizobium

  • 4. 
    For retting of jute, the fermenting microbe is:

  • Methanophilic bacteria
  • Butyric acid bacteria
  • Helicobactor pylon
  • Streptococcus lactin
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