Question

for nitrogen fixation in soil we may use-
A - Cyanobateria
B - Protozoans
C - Nematodes
D - Wheat plants

Answer 1

why nitrogen fixation and soil we May cyanobacteria
that is option A

Answer 2

The answer to the question is Cyanobacteria’s. Both free-living cyanobacteria and the cyanobacterial partners of lichens at first contributed nitrogen to the dirt by framing a cryptobiotic covering.

Presently various leguminous plants happen in this desert, with nitrogen-settling Rhizobium in their root knobs.

Precedents are the green-stemmed brush-like trees at the privilege and left of the picture (Parkinsonia species, basic name "paloverde"), and a few acacias and mesquites