Identify the odd-man out regarding " Plants and prokaryotes involved in nitrogen fixation".

Options

A. Lichens
B. Anthoceros
C. Azolla
D. Rhizobium

Answer

D

Explanation

Reason : Cyanobacteria found in Lichens, Anthoceros and Azolla and not in Rhizobium (symbiotic bacterium).

Symbiotic bacterium like rhizobium fixes atmospheric nitrogen . Cyanobacteria found in lichens anthoceros azolla and coralloid roots of cycas also fix nitrogen Non-symbiotic (Free living bacteria) like clostridium also fix nitrogen.