Which mineral element plays an essential role in nitrogen fixation?

  • A
    Copper
  • B
    Manganese
  • C
    Zinc
  • D
    Molybdenum

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We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. Can we artificially induce the property of nitrogen fixation in a plant,whether leguminous or non-leguminous?

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

Identify the free-living $N_2$-fixing bacteria.

Nitrogen-fixing bacteria convert which of the following?

Which enzyme is involved in nitrogen metabolism?

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