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Q.
One of the free-living, anaerobic nitrogen-fixer is
AIPMTAIPMT 2010Mineral Nutrition
Solution:
Many free living bacteria and blue green algae are capable to fix atmospheric nitrogen Rhodospirillum is a free living photosynthetic anaerobic nitrogen fixing non-sulphur bacteria. It is capable of synthesizing its organic food in presence of light and in absence of 02 by a process known as bacterial photosynthesis. Beijernickici and Azotobacter are free living but aerobic nitrogen fixing bacteria. Rhizobium is a symbiotic nitrogen fixing bacteria.