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NTA Abhyas NEET2020BotanyMineral NutritionPractice

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

Options

  1. ARhizobium
  2. BStreptococcus
  3. CAzotobacter
  4. DClostridium

Correct answer

D. Clostridium

Step-by-step 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.

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