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Q.

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.
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Which of the following option has only photoautotrophic organisms that can fix atmospheric nitrogen?