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Nitrogen fixation can be done by ______________

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Nitrogen fixation can be done by ______________

(a) All prokaryotes

(b) Certain cyanobacteria

(c) Certain archaebacteria

(d) None of the mentioned

The question was posed to me in unit test.

Question is taken from Two Fundamentally Different Classes of Cells topic in division Introduction to Cell of Cell Biology

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Correct option is (b) Certain cyanobacteria

The explanation: Certain cyanobacteria have the unique property to fix nitrogen i.e., conversion of nitrogen gas into reduced ammonia. Certain cyanobacteria remain in a symbiotic relationship in the roots of legume plants such as peas and help in nitrogen fixation. Eg. Rhizobium, Azotobacter, etc.

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