(C) Blue-green algae (Cyanobacteria) are known as biofertilizers. They are capable of fixing atmospheric nitrogen into the soil. By adding organic mat

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(C) Blue-green algae (Cyanobacteria) are known as biofertilizers. They are capable of fixing atmospheric nitrogen into the soil. By adding organic matter and nitrogenous compounds to the soil,they enhance the soil fertility. Therefore,they primarily increase the organic content of the soil.