EXOELECTROGENS ARE CAPABLE OF EXPORTING ELECTRONS OUT OF THEIR CELLS AND HAVE GREAT AFFINITY WITH ELECTRODES;HENCE THEY TRANSFER EXCESS ELECTRONS PRODUCED DURING PHOTOSYNTHESIS OR RESPIRATION .MANY BACTERIA AND ALGAE ARE ELECTRO ACTIVE AND MACRO ALGAE ARE ONE OF THEM AND HAVE BEEN FOUND TO BEMORE EFFICIENT THAN BACTERIA AS EVIDENT FROM THE EXPERIMENTS BY SHLODBERG ON ULVA.