Question

The cloaca in a frog is a common chamber for the urinary tract, reproductive tract and
A. Alimentary canal
B. Respiratory system
C. Hepatic portal vessels
D. Notochord
E. Lymphatic system

Answer 1

Cloaca is a small sac-like structure that opens the anus, urogenital aperture, and urinary bladder. It opens outside the body through a cloacal aperture that is located at the posterior end of the body.

Complete answer:
The cloaca in a frog is a common chamber for the urinary tract, reproductive tract, and alimentary canal. In a male frog, the duct arising from the kidney is both a urinary duct and a sperm duct. Hence, called the urogenital duct. The urogenital duct runs posteriorly and opens into the cloaca. The cloaca is the common chamber for urine, sperms, and fecal. These are passed through the cloacal aperture.

Frog being ureotelic animals excrete urea along with water. The blood is filtered in the kidney, where all the wastes are filtered out and the useful is reabsorbed in the blood. The remaining wastes from the urine which is carried out of the kidney by the collecting vessels into the ureter, which ultimately passes into the cloaca.

Hence the correct answer is option ‘A’.

Note: It is to be noted that the urinogenital duct and rectum transfer their products into the cloaca. The ileum of the frog leads into a wide tube called the rectum. The rectum or intestine is broad and has a thin wall. It opens into the cloaca. Therefore, the cloacal is a common chamber for reproduction as well as excretion.