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STD 12 - 8. microbes in human welfare — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 8. microbes in human welfare1 Mark
MCQ
The common nitrogen­fixer in paddy fields is
  • A
    Rhizobium
  • ✓
    Azospirillum
  • C
    Oscillatoria
  • D
    Frankia.
✓

Answer

Correct option: B.
Azospirillum
b
(b) : Azospirillum is an anaerobic nitrogen fixing bacteria which forms loose association with roots of some plants. Inoculation of paddy fields with these bacteria helps in increasing yield and saving of nitrogen fertilizers.

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