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

ಉತ್ತರ ತೋರಿಸು ಮತ್ತು ವಿವರಣೆ

ಉತ್ತರ: (C) Azolla

ವಿವರಣೆ

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