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 A Azotobacter
Azotobacter can act both as symbiotically and non symbiotically to increase soil fertility. It Infuse the soil with antibiotic pesticides and inhabit the spread of soil borne diseases like pythium and phytophthora.

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