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Question
Which of these processes helps in nitrogen fixation?
Options:
A .  Combustion
B .  Lightning 
C .  Respiration
D .  Transpiration
Answer: Option B
:
B
Nitrogen fixation is an essential biological process by which nitrogen in the atmosphere is converted into ammonia. Lightning is one of the physical processes that convert nitrogen into oxides of nitrogen. These oxides then dissolves in water to form nitrates and fall on land along with rain.

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