Question:
Which one as used/regarded as biofertiliser?
Which one as used/regarded as biofertiliser?
Updated On: Aug 15, 2022
- A association between pteridophytes and cyanobacteria Anabaena
- A association between gymnosperms and Nostoc
- A association between legume and Rhizobium
- All of the above
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The Correct Option is D
Solution and Explanation
Cyanobacteria either free living of symbiotic are considered as biofertiliser because the fix atmospheric nitrogen in form of nitrates and nitrites by biological process. They leaves of Azolla pteridophytes has as many as $80,000$ BGA and fix atmospheric $N _{2}$ in field of rice.
Nostoc with corrolloid roots of Cycas also fix atmospheric nitrogen. Soil nitrogen is maintained by association between Rhizobium and root nodule of legume.
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There are several valuable microorganisms that are beneficial to humans in various manners such as:
In Household Products
- Fermentation of milk to produce yogurt.
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- Production of beverages such as wine, beer, whiskey, brandy, or rum.
- Production of antibiotics such as Penicillin and other chemical substances to kill or retard the expansion of disease-causing microbes.
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