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(B) $\rightarrow$ Some cyanobacteria live in a mutually beneficial relationship with plants,obtaining food and shelter while fixing nitrogen for the p

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They fix atmospheric nitrogen and improve soil fertility.

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(B) $\rightarrow$ Some cyanobacteria live in a mutually beneficial relationship with plants,obtaining food and shelter while fixing nitrogen for the plant. They also reduce soil alkalinity and improve soil texture.$\rightarrow$ $Nostoc$,$Anabaena$,and $Oscillatoria$ are Blue-Green Algae $(BGA)$ that can fix atmospheric nitrogen.$\rightarrow$ In paddy fields,cyanobacteria serve as an important biofertilizer.$\rightarrow$ $BGA$ also add organic matter to the soil and increase its fertility.

What is the principle underlying the use of cyanobacteria in agricultural fields for crop improvement?

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