Microbes as Biofertilizers
Biofertilizers are the organisms that enrich the nutrient quality of the soil. Their main sources are bacteria, fungi and cyanobacteria (algae)
Name of the microorganisms |
Uses |
| Rhizobium bacteria | Fix atmospheric nitrogen into organic forms which are used by the leguminous plants |
| Azospirillum and Azotobacter (free living bacteria) | Fix atmospheric nitrogen |
| Fungi form symbiotic associations with plants (mycorrhiza) | Absorbs phosphorus from soil and provides to the plant |
| Cyanobacteria- Anabaena, Nostoc, Oscillatoria (autotrophic microbes) | fix atmospheric nitrogen |
| cyanobacteria | Used in paddy fields as it is an important fertilizer that increases soil fertility |
Microbes in Human Welfare Notes
CBSE Class 12 Chapter 8 Microbes in Huaman Welfare: Microbes are the smallest living organisms that can only be seen under the microscope. Microbes are found everywhere. Examples- are air, water, soil, inside and outside the bodies of plants and animals, thermal vents (1000 degree Celsius), under the layers of snow, and in acidic environments. All microbes are not harmful, some are very useful. Microbes are pathogenic in nature but some microbes are beneficial for humans.