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Standard IX
Biology
Biofertilizers
Which of the ...
Question
Which of the following is not an aerobic nitrogen fixing free living bacteria?
A
Azospirillum
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B
Azotobacter
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C
Beijerinickia
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D
Chromatium
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Solution
The correct option is
D
Chromatium
Azospirillium
is Gram-negative, aerobic nitrogen-fixing bacteria.
Azotobacter
is aerobic and free-living nitrogen-fixing bacteria.
Beijerinckia
is a free-living aerobic nitrogen-fixing organism.
Chromatium
is gram-negative bacteria found in water which is anaerobic nitrogen fixer.
So, the correct answer to this question is '
Chromatium'.
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