$A$ free-living anaerobic bacterium capable of $N_2$ fixation in soil is

  • A
    Rhizobium
  • B
    Azotobacter
  • C
    Streptococcus
  • D
    Clostridium

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Molybdenum is the essential constituent of

Which mineral is essential for the activity of the nitrogenase enzyme in $N_2$ fixation?

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