The microbial biofertilizers which can act both symbiotically and non-symbiotically to increases soil fertility are?

Azotobacter

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Rhizobium

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Clostridium

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Nostoc and Anabaena

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Solution

The correct option is D Azotobacter
Azobacter is a free-living nitrogen-fixing bacterium, which is used as a biofertilizer is the cultivation of most crops. Azobacter is usually motile, oval, or spherical bacteria, form thick-walled cysts and may produce large quantities of capsular time.
So, the correct option is 'Azobacter'.

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Similar questions

Which of the following is used as biofertilizer?
I. Cyanobacteria
II. Yeast
III. Symbiotic bacteria
IV. Free living bacteria

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