Multiple choice

Which N2 fixing bacterium forms loose association with roots of grasses?

  1. Azospirillum

  2. Azotobacter

  3. Rhizobium

  4. Bacillus

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A Correct answer
Explanation

Azospirillum is a nitrogen-fixing bacterium that lives in the rhizosphere and forms a loose association with the roots of grasses and cereal crops.