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Question

The bacterium capable of anaerobic N2 fixation is known as

A
Clostridium
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B
Bacillus
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C
Azotobacter
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D
Rhizobium
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Solution

The correct option is B Clostridium
Non-symbiotic nitrogen fixation is carried out by free-living organisms in the soil, such as bacteria, blue-green algae.
Bacteria include aerobic bacteria, such as Azotobacter and anaerobic bacteria, such as Clostridium, Chlorobium and Chromatium.
So, the correct answer is option A.

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