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Question

How many of the following organisms cannot fix the atmospheric nitrogen in a free living condition?
Frankia, Anabaena, Rhodospirillum, Beijernickia, Rhizobium, Azotobacter, Nostoc

A
2
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B
4
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C
5
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D
3
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Solution

The correct option is A 2
Rhizobium, associated with leguminous plants and Frankia, associated with certain non-leguminous plants are symbiotic nitrogen fixing microbes. While Anabaena, Rhodospirillum, Beijernickia, Azotobacter, Nostoc are all free living nitrogen fixing microbes.

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