Consider the following regarding the reasons for the fact that now Cyanobacteria are kept in Monera and not in Plantae:
I. They are prokaryotes.
II. The cell wall of cyanobacteria has peptidoglycan.
III. They can fix atomspheric nitrogen
The correct explanations would be:
(1) I and II only
(2) I and III only
(3) II and III only
(4) I, II and III
(4) The only confusion can be choice III. Only prokaryotes can fix atmospheric nitrogen.