CBSE  /  Class 12  /  Biology  /  Microbes in Human Welfare

  • 1. 
    Bacillus thuringiensis (Bt) strains have been used for designing novel:

  • Bio-metallurigcal techniques
  • Bio-mineralization process
  • Bio-insecticidal plants
  • Bio-fertilizers

  • 2. 
    Streptococcus is used in the preparation of:

  • Wine
  • Idli
  • Paneer
  • Bread

  • 3. 
    Nif gene occurs in:

  • Peiiicillium
  • Rhizobium
  • Aspergillus
  • Streptococcus

  • 4. 
    Azoila has symbiotic relationship with:

  • Chlotfila
  • Anabaena
  • Nostoc
  • Tolypothrix

  • 5. 
    Term antibiotic was first used by :

  • Flemming
  • Pasteur
  • Waksman
  • Lister

  • 6. 
    A free living anaerobic nitrogen fixing bacterium is:

  • Rhizobium
  • Streptococcus
  • Azotobactor
  • Clostridium

  • 7. 
    Citric acid is produced by:

  • Rhizopus
  • Mucor
  • Aspergillus
  • Saccharomyces

  • 8. 
    In nostoc, enzyme nitrogenase occurs in :

  • Vegetative cells
  • Heterocysts
  • Both (a) and (b)
  • Only in hormogones

  • 9. 
    Usnic acid is an antibiotic obtained from :

  • Fungi
  • Bacteria
  • Lichens
  • Algae

  • 10. 
    By anobacteria are useful biofertilizers in the; field of:

  • Wheat
  • Maize
  • Rice
  • Sugarcane
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