[" 177) Which of the following statement is not correct? "],[" A) Cyanobacteria with heterocyst only are biofertilizers "],[" B) Cyanobacterial biofertilizers are autotrophic "],[" G Cyanobacterial biofertilizers may be symbiotic or "],[" asymbiotic "],[" D) All cyanobacteria are not biofertilizers "]