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

Which one of the following does not have the ability to divide?

Ability to fix atmospheric nitrogen is found in

Which of the following species does not have tetrahedral geometry ?

Which of the following species does not have tetraahedral geometry ?

Which of the following is a cyanobacterium that can fix atmospheric nitrogen ? Azospirillum, Oscillatoria, Spirulina

Explain the fixing of atmospheric nitrogen.

Which of the following enzymes fixes nitrogen?

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