Azolla possesses symbiotic association with
Anabaena
Nostoc
Azospirillum
Rhizobium
How do microbes reduce the environmental degradation caused by chemicals ?
The main sources of biofertilisers are
$(a)$ Bacteria
$(b)$ Cyanobacteria
$(c)$ Fungi
$(d)$ Protists
Which of the following cyanobacteria can fix atmospheric nitrogen?
$I.$ Anabaena
$II.$ Oscillatoria
$III.$ Nostoc
Choose the correct option
Bacteria found in root nodules of legumes are
The best fertilizer for paddy is