Which of the following is used as biofertiliser?
$I.$ Cyanobacteria
$II.$ Yeast
$III.$ Symbiotic bacteria
$IV.$ Free living bacteria
Choose the correct option
$VAM $ is important for
Aquatic fern which is an excellent biofertilizer
Root nodules for nitrogen fixation of a non-leguminous tree possess
Which of the following is common to Azospirillum, Anabaena, Nostoc and Oscillatoria