Question:
One of the free-living, anaerobic nitrogen-fixer is
One of the free-living, anaerobic nitrogen-fixer is
Updated On: Jul 28, 2022
- Beijernickia
- Rhodospirillum
- Rhizobium
- Azotobacter.
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The Correct Option is B
Solution and Explanation
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.
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Concepts Used:
Metabolism of Nitrogen
Nitrogen Cycle
The central part of nitrogen metabolism is the Nitrogen Cycle. A nitrogen molecule is made of two nitrogen atoms held together by a solid triple covalent bond (N ≡ N). There are three central pools of nitrogen – atmosphere, soil, and biomass.
Atmospheric Pool
The process of converting atmospheric nitrogen (N2) to ammonia (NH3) is called nitrogen fixation. Atmospheric nitrogen is rooted in three ways – biological, electrical, and industrial.
Soil Pool
The above processes rooted atmospheric nitrogen into the soil. This nitrogen is then taken up by plants and animals, accordingly.
Biomass Pool
When plants and animals die, the organic nitrogen within them has degraded to ammonia the process is ‘Ammonification‘ and it returns nitrogen back to the soil.