Nitrogen fixation can be done by ______________(a) All prokaryotes(b) Certain cyanobacteria(c) Certain archaebacteria(d) None of the mentionedThe 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

Nitrogen fixation can be done by ______________(a) All prokaryotes(b)

1.	Nitrogen fixation can be done by ______________(a) All prokaryotes(b) Certain cyanobacteria(c) Certain archaebacteria(d) None of the mentionedThe 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
Answer» 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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