A nitrogen-fixing bacterium, which forms a loose association with the roots of crop plants (grasses) is
Azotobacter
Bacillus polymyxa
Clostridium
Azospirillum
A
Azotobacter
B
Clostridium
C
Bacillus polymyxa
D
Azospirillum
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Solution
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Azospirillum is a free-living nitrogen-fixing bacteria closely associated with crops of grass family
So, the correct answer is 'Azospirillum'
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