Q.Fill in the blank: Excretion in frog is done by __________.

A frog's excretory system is built around a pair of kidneys, which filter nitrogenous waste from the blood and pass it via ureters to the urinary bladder for elimination.

Frogs possess a pair of dark-red, elongated mesonephric (opisthonephric) kidneys situated dorsally in the abdominal cavity, one on either side of the vertebral column. Each kidney is drained by a ureter, which in the male frog also carries sperm and opens into the cloaca; urine collects temporarily in a urinary bladder before being expel …