questions: asking about action of pseudomonas fluorescens 
 answers: -by secreting an enzyme, it has the capability to destroy the cell wall of the fungal pathogens and annihilate them
-it secrets hydrogen cyanide and antibiotics such as pycocyanin and phenazine, which inhibit the growth of disease causing pathogens
-it also produces siderospores which chelate with iron in the soil, and make it difficult for the pathogens to proliferate
-further, it secretes several plant growth substances, and these gibberellins like compounds contribute to vigorous crop growth