Question

for nitrogen fixation in soil we may use-A - CyanobateriaB - ProtozoansC - NematodesD - Wheat plants

Answer 1

A - Cyanobateria

i think its is option A

Answer 2

For nitrogen fixation in soil we may use Cyanobateria which is know as cyanophyta are phylum of bacteria which obtain major energy via photosynthesis and also only photosynthetic prokaryotes to deliver the oxygen.

From the names cyanobacteria from the major color of the bacteria. Hope this answer is helpful for the student to get clear ideas on it at the time of preparing for the exam.