Cyanobacteria are prokaryotic blue-green algae belonging to the class-Cyanophyceae or Myxophyceae. These contain chlorophyll-$a,$ carotenoids and three phycobiliproteins (blue-green pigments) $c$-phycocyanin, allophycocyanin and $c$-phycoerythrin.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.