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Question

A nitrogen-fixing bacterium, which forms a loose association with the roots of crop plants (grasses) is
  1. Azotobacter
  2. Bacillus polymyxa
  3. Clostridium
  4. Azospirillum

A
Azotobacter
B
Clostridium
C
Bacillus polymyxa
D
Azospirillum
Solution
Verified by Toppr

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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