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

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 8. microbes in human welfare1 Mark
MCQ
Azotobacter and Bacillus polymyxa are
  • A
    Decomposers
  • ✓
    Nonsymbiotic nitrogen fixers
  • C
    Symbiotic nitrogen fixers
  • D
    Pathogenic bacteria
✓

Answer

Correct option: B.
Nonsymbiotic nitrogen fixers
b
(b)Azotobacter and Bacillus polymyxa are free living or non-symbiotic nitrogen fixing bacteria of soil, which increase fertility of soil and hence yield of crop plants.

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