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Q.

Which of the following serve as an important biofertilizer in paddy fields? 

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a

Rhizobium

b

Baculovirus

c

Glomus

d

Anabaena

answer is D.

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Detailed Solution

Anabaena fix nitrogen in rice fields. In paddy fields, cyanobacteria serve as an important biofertiliser. Blue green algae also add organic matter to the soil and increase its fertility. Examples are Anabaena circinalis,  Anabaena variabilis, Anabaena azollae etc.

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Which of the following serve as an important biofertilizer in paddy fields?