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A nitrogen-fixing microbe associated wit...

A nitrogen-fixing microbe associated withAzolla in rice fields is

A

Frankia

B

Rhizobium

C

Spirunlina

D

Anabaena

Text Solution

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The correct Answer is:
D
Anabaena azollae, a cyanobacterium that lives in symbiotic association with the free folating water ferm Azolla. Anabaena azollae can grow photo-autotrophically and fixed atmospheric nitrogen. The inoculation of cyanobacteria in rice crop significantly influences the growth of rice crop by secretion of ammonia in flood water.
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