What is the other name of blue green algae ? Is it cynobacteria? If yes then may i know whether it is a bacteria of an algae?But if no then what is its oher name.

The other name of blue green algae is cyanobacteria. Their cell structures and compositions are same as prokaryotic gram negative bacterial cells. For this reason they are considered as bacteria. At the same time as they are aquatic and photosynthetic, they are called blue green algae. Only the presence of chloroplast inside their cells relates them to algae, else all other characters resemble bacteria only.