P is the nitrogen fixing bacteria, whereas Q is the nitrogen fixing cyanobacteria. Here, P and Q are respectively

Rhizobium and Azotobacter

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Nitrosomonas and Rhizobium

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Nostoc and Azotobacter

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Rhizobium and Nostoc

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Solution

The correct option is D Rhizobium and Nostoc
P is nitrogen fixing bacteria Rhizobium, while Q is nitrogen fixing cyanobacteria Nostoc also known as blue-green algae.

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