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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare1 Mark
MCQ
Which one is a non-symbiotic nitrogen fixer?
  • A
    Rhizobium
  • B
    Anabaena
  • C
    Nostoc
  • D
    Bradyrhizobium
✓

Answer

  1. Nostoc

Explanation:

Nostoc is a free-living (non-symbiotic) autotrophic Cyanobacteria and used as biofertilser for wetland rice and can provide 25-30 kg nitrogen/ hectare. The heterocysts are the sites of nitrogen fixation. Heterocyst formation occurs only in filamentous Cyanobacteria.

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