Discussion
Lightning plays important role in ............. cycle.
Answer: B
Lightning plays an important role in the nitrogen cycle.
Atmospheric nitrogen (N2) is held by a strong triple bond and cannot be used directly by most plants. The intense heat of a lightning flash splits N2 and O2, which combine to form nitrogen oxides. These dissolve in rain as nitrates, which reach the soil and are absorbed by plants. This atmospheric fixation supplements biological fixation by bacteria.
Lightning has no comparable role in the oxygen, carbon or phosphorus cycles. Phosphorus, in particular, has no significant gaseous phase.
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