Q.

_________ serve as an important bio-fertilizer in paddy fields.

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a

Cyanobacteria

b

Azotobacter

c

Methanobacterium

d

Mycorrhiza

answer is A.

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Detailed Solution

Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen. In paddy fields, cyanobacteria serve as an important biofertiliser.

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