The option is (d) Spirogyra
Members of Kingdom Monera bacteria and cyanobacteria (blue green algae) have the ability to fix nitrogen. Azotobacter is a N 2 fixing bacteria. Anabaena and Nostoc are heterocystous bluegreen algae. The heterocysts are the sites of N 2 fixation. Spirogyra is one of the commonest green algae. It has no function in nitrogen fixation.