Which of the following is a free-living, aerobic nitrogen-fixing bacterium?
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Correct answer: Azotobacter
Azotobacter and Beijerinckia are examples of free-living aerobic nitrogen fixers. Rhodospirillum is also free-living but is anaerobic, while Rhizobium is symbiotic.
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More Nitrogen cycle in nature questions
- The symbiotic nitrogen-fixing bacterium Rhizobium is found in the root nodules of:
- Which microbe forms nitrogen-fixing nodules on the roots of the non-leguminous plant Alnus?
- The pink-colored pigment found in the nodules of leguminous plants, which acts as an oxygen scavenger, is:
- How many molecules of ATP are required for the production of one molecule of $NH_3$ during biological nitrogen fixation?
- During nodule formation, the curling of root hairs is induced by:
- The first stable product of biological nitrogen fixation is: