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Q.

The bacteria which can fix atmospheric nitrogen in it’s free-living form in the soil are

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a

Azospirillum and Azorhizobium

b

 Azospirillum and Azotobacter

c

Azotobacter and Rhizobium

d

Frankia and Azospirillum

answer is B.

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Detailed Solution

Some bacteria  like Azospirillum and Azotobacter can fix atmospheric nitrogen while free-living in the soil, thus enriching the nitrogen content of the soil.

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