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Questions  

Which of the given monerans fixes nitrogen symbiotically as well as in free-living state?

a
Rhizobium
b
Azotobacter
c
Frankia
d
Anabaena

detailed solution

Correct option is D

Anabaena is a filamentous autotrophic cyanobacteria, fixes nitrogen symbiotically as well as in free-living state. Anabaena  azollae, although it can exist on it’s own, is usually found within ovoid cavities inside the leaves of the water fern Azolla.

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Similar Questions

Read the following statements and identify the organisms.
(a) They have chlorophyll a similar to green plants.
(b) They often form blooms in polluted water bodies.
(c) They can fix atmospheric nitrogen.


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