Which of the following cyanobacteria can fix atmospheric nitrogen?
$I.$ Anabaena
$II.$ Oscillatoria
$III.$ Nostoc
Choose the correct option
$I \, \& \, II$
$II \, \& \, III$
$I \, \& \, III$
$I, II \, \& \, III$
Mycorrhiza is helpful in
The chemical fertilizer required for better rhizobial nitrogen fixation is
The symbiotic association of fungi with plants is known as ____which is formed by many members of the fungal genus_____.
Leghaemoglobin occurs in
Due to which of the following organism, yield of rice is increased