Q38 / 161 · NTA Abhyas (NEET) 2020 · Botany · Mineral Nutrition

A free-living, anaerobic, nitrogen-fixing bacterium is

  • A
    Rhizobium
  • B
    Streptococcus
  • C
    Azotobacter
  • Correct answer
    D
    Clostridium

Solution

Rhizobium can carry out nitrogen fixation only in a symbiotic state when it forms root nodules with leguminous plants. Azotobacter is a free-living aerobic nitrogen fixer and Clostridium is a free-living anaerobic nitrogen fixer. Streptococcus is saprophytic bacteria.

Hence, the correct answer is option: 'D'.

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