Which mineral element plays an essential role in nitrogen fixation?

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

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$N_{2} + 8e^{-} + 8H^{+} \rightarrow 2NH_{3} + H_{2}$
The above equation refers to:

Which one of the following plants cannot fix atmospheric nitrogen directly?

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