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Azospirillum- Symbiotic nitrogen fixer

Glomus- Mycorrhiza

Cyanobacteria- Paddy fields

Rhizobium – Roots of sweet clover

answer is A.

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Detailed Solution

Azospirillum can fix atmospheric nitrogen while living freely in the soil.

Many members of the genus Glomus form mycorrhiza.

In paddy fields, cyanobacteria serve as an important biofertilizer by fixing atmospheric nitrogen in the soil.

Rhizobium has legume-bacteria relationship with the roots of several legumes such as alfalfa, sweet clover, sweet pea, lentils, garden pea, broad bean, clover beans, etc.

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