Which one is filamentous, autotrophic and can fix atmospheric nitrogen through specialized cells?
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a
Frankia
b
Nostoc
c
Azotobacter
d
Rhizobium
answer is B.
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Detailed Solution
Nostoc is a filamentous cyanobacteria. It has vegetative cells which help in carbon dioxide fixation hence they are autotrophic. They have specialized cells called heterocyst that help in fixation of atmospheric nitrogen.