Which of the following are free-living nitrogen-fixing bacteria?

  • A
    Rhizobium,Azotobacter
  • B
    Pseudomonas,Chlamydomonas
  • C
    Nostoc,Anabaena
  • D
    Azospirillum,Azotobacter

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Leghaemoglobin takes part in

Which of the following bacteria are free-living nitrogen fixers?
$(i)$ $Pseudomonas$ $(ii)$ $Azospirillum$
$(iii)$ $Azotobacter$ $(iv)$ $Nostoc$

Which of the following can use molecular nitrogen as a nutrient?

The enzyme nitrogenase,present in the root nodules of leguminous plants,catalyzes the conversion of atmospheric nitrogen into which of the following products?

$Azotobacter$ and $Bacillus \text{ } polymyxa$ are:

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