Atmospheric nitrogen can be fixed by:
(i) Some fungi.
(ii) Some protozoa.
(iii) Some blue green algae.
(iv) Some virus.
(v) None of these.
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Answer:
Cyanobacteria provide nitrogen to fungi by fixing atmospheric nitrogen. Rhizobium species are heterotrophic organisms growing in the roots of leguminous plants. Rhizobiums fix atmospheric nitrogen under low-oxygen pressure, and provide ammonium to plants.
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The answer is (iii) Some Blue green algae
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