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Question
The bacterium capable of anaerobic nitrogen fixation is
The bacterium capable of anaerobic nitrogen fixation is
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Solution
The correct option is D Clostridium
Plants cannot absorb atmospheric nitrogen directly. They absorb nitrogen in the form of ammonium, nitrate and nitrite ions. Azotobacter species are free-living, nitrogen-fixing bacteria; in contrast to Rhizobium species, they normally fix molecular nitrogen from the atmosphere without symbiotic relations with plants, although some Azotobacter species are associated with plants. Clostridium is anaerobic nitrogen fixer.
Plants cannot absorb atmospheric nitrogen directly. They absorb nitrogen in the form of ammonium, nitrate and nitrite ions. Azotobacter species are free-living, nitrogen-fixing bacteria; in contrast to Rhizobium species, they normally fix molecular nitrogen from the atmosphere without symbiotic relations with plants, although some Azotobacter species are associated with plants. Clostridium is anaerobic nitrogen fixer.
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