Symbiotic nitrogen fixation in non-leguminous plant is carried out by

Azotobacter

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Bradyrhizobium

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Clostridium

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Frankia

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Solution

The correct option is D Frankia
Symbiotic nitrogen fixation in non-leguminous plants belonging to the family Betulaceae, Myceraceae, Rosaceae, Casuarinaceae is carried out by actinomycetes, Frankia. In Frankia nodules are formed but they are not coloured and devoid of leghaemoglobin.
Azotobacter is a free living aerobic nitrogen fixing bacteria.
Bradyrhizobium is a bacteria that fix nitrogen in the roots of leguminous plants.
Clostridium is a free living anaerobic nitrogen fixing bacteria.
Thus, the correct answer is option D.

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