Question

What is nitrogen fixation?
What is the need of converting atmospheric nitrogen into compounds of nitrogen?

Answer 1

Nitrogen fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). ... Within the nodules the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
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Answer 2

Nitrogen fixation. into ammonia, which is metabolized by most organisms. Nitrogen fixation is essential to life because fixed inorganic nitrogen compounds are required for the biosynthesis of all nitrogen-containing organic compounds, such as amino acids and proteins, nucleoside triphosphates and nucleic acids.