Non-biological nitrogen fixation is

Electrochemical and photochemical

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Rhizobial

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Cyanobacterial

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None of the above

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Solution

The correct option is A Electrochemical and photochemical
Non biological nitrogen fixation is achieved by lightning converting nitrogen and oxygen into nitrogen oxides. Nitrogen oxides may react with water to make nitrous acid or nitric acid,which seeps into the soil , where it makes nitrate , which growing plants can easily use it.
So the correct option is "eletrochemical and photochemical".

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