First slide

Kingdom Monera

Question

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

Easy

A

Rhizobium
B

Azotobacter
C

Frankia
D

Anabaena

Solution

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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