Which of the following is a cyanobacterium that can fix atmospheric nitrogen?

Which of the following organisms can fix atmospheric nitrogen as free living organisms as well as symbionts?

Which of the following species does not have the ability to fix atmospheric nitrogen?

Which of the following species does not have the ability to fix atmospheric nitrogen?

Which of the following species does not have the ability to fix atmospheric nitrogen?

Describe the bacteria which fix atmospheric nitrogen.

Photoautotrophic cyanobacteria which can fix atmospheric nitrogen is/are

Explain the fixing of atmospheric nitrogen.

An organism that fixed atmospheric nitrogen in the soil is: