Question

define nitrogen fixation. also name the bacteria which help in N2 fixation .

Answer 1

Heya mate,
Here's your answer
=> Nitrogen fixation is a process by which nitrogen in the air is converted into ammonia or related nitrogenous compounds.
Rhizobium help in nitrogen fixation.
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Answer 2

nitrogen fixation is a process by which atmospheric nitrogen is converted into simpler form like ammonium and taken into soils

a bacteria which help in nitrogen fixation is blue green algae and rhizobium