NEET BIOLOGY

Detailed explanation-1: -Bacterias like Azotobacter and Azospirillum fix atmospheric Nitrogen while free living in soil, thus enriching Nitrogen content of soil.

Detailed explanation-2: -Bacteria such as Rhizobium and certain blue-green algae can fix atmospheric nitrogen in the soil.

Detailed explanation-3: -Azotobacter and Azospirillum are two genera of bacteria that are important for nitrogen fixation. They are both gram-negative, free-living bacteria that promote plant growth.

Detailed explanation-4: -Azospirillum, a free-living nitrogen-fixing bacterium closely associated with grasses: genetic, biochemical and ecological aspects.

Detailed explanation-5: -Azotobacter species are free-living, nitrogen-fixing bacteria; in contrast to Rhizobium species, they normally fix molecular nitrogen from the atmosphere without symbiotic relations with plants, although some Azotobacter species are associated with plants.