Question

the bacteria..... supply natural manure to paddy fields
A) azolla
B) Anabaena
C) Azatobater
D) Nostoc

Answer 1

Hlo mate....

here is your answer....

Correct answer is (A).....

I hope it help you......

Answer 2

The bacteria that supplies natural manure to paddy fields is Azolla.

Azolla is a Pteridophyte  bacteria. This bacteria contains endo symbionts. these fix nitrogen in soil and supply required nutrients suitable for the growth of the paddy plants.

The nitrogen fixation is possible by the cyanobacterium called Anabaena azollae.

They belong to the family Nostocaceae.