The aquatic plant commonly used as biofertilizer in water-logged rice fields is:

उत्तर दाखवा आणि स्पष्टीकरण

उत्तर: (C) Azolla

स्पष्टीकरण

Azolla hosts the nitrogen-fixing cyanobacterium Anabaena and is used as a biofertilizer in paddy.