Cyanobacteria have great potential in serving the humanity in many ways. The diazotrophic nature, wide distribution pattern and capability to enter into N fixing symbiosis of BGA make them very attractive for research. In Agriculture, Cyanobacteria has a long history of usage in the form of biofertilizers. Other major applications of cyanobacteria in diverse fields of human welfare such as food and animal feed, in bioremediation of toxic compounds, in biocontrol of pests, production of commercial and laboratory chemicals, restriction enzymes, pharmacological tools (Patterson, 1996)and...