Multiple choice Which one of the following is a phosphate solubilising microorganism? Bacillus subtilis Acetobacter diazotroph Rhizobium radicicola Azotobacter vinelandii Reveal answer Fill a bubble to check yourself A Correct answer Explanation Bacillus subtilis is a well-known phosphate solubilizing bacterium that helps convert insoluble phosphorus into a form plants can absorb.