Correct Answer - Option 4 : Azolla
The correct answer is Azolla.
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Azolla is also known as mosquito ferns are aquatic ferns.
- They are extremely reduced in form and specialized, looking nothing like the typical fern but more resembling duckweed or some mosses.
- It can be used as animal feed, human food, medicine, and water purifier.
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It is also used as a bio-fertilizer which improves soil fertility and boosting crop yields.
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Azotobacter:
- It is a genus of free-living diazotrophic bacteria whose resting stage is a cyst.
- It is primarily found in neutral to alkaline soils, in aquatic environments, and on some plants.
- It has several metabolic capabilities, including atmospheric nitrogen fixation by conversion to ammonia.
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Azospirillum:
- Azospirillum is one of the most studied plant growth-promoting bacteria (PGPB).
- It represents a common model for plant-bacterial interactions.
- While Azospirillum brasilense is the species that is most widely known, at least 22 species
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Rhizobium:
- Rhizobium is a genus of bacteria associated with the formation of root nodules on plants.
- These bacteria live in symbiosis with legumes.
