How does Azotobacter contribute to nitrogen fixation in the soil?

Show Answers

Through a symbiotic relationshipBy fixing nitrogen independently without a hostBy both symbiotic and non-symbiotic methodsNone of the aboveNot applicable

Explanation

Azotobacter is a free-living bacterium that fixes atmospheric nitrogen non-symbiotically, meaning it does not require a host plant for nitrogen fixation. Therefore, option B is correct.