Which of the following option has only photoautotrophic organisms that can fix atmospheric nitrogen?
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a
Anabaena, Aulosira and Rhizobium
b
Nostoc, Frankia and Azotobacter
c
Anabaena, Nostoc and Oscillatoria
d
Azotobacter, Rhizobium and Azolla
answer is C.
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Detailed Solution
Cyanobacteria such as Anabaena, Nostoc and Oscillatoria are nitrogen fixing photosynthetic organisms. They add organic matter to the soil, increase its fertility and reduce alkalinity of soil.