Question

In Frog, ureters open in
A.Rectum
B.Urinary bladder
C.Colon
D.Cloaca

Answer 1

Frogs live both on land and in freshwater and it belongs to the class Amphibia, phylum Chordata. In India, the most common species of frog found in the Rana tigrina. They are called poikilotherms which means cold-blooded and they go for summer sleep. They can camouflage from their predators like a snake. During very high temperatures they take shelter in deep burrows to protect themselves from extreme cold and extreme heat.

Complete answer: In frogs, the elimination of nitrogenous wastes occurs through a well-developed excretory system. The excretory system consists of the ureter, a pair of kidneys, cloaca, and urinary bladder. The excretory system is similar to that of mammals and two kidneys remove nitrogenous waste from the blood.
Two ureters come out from the kidneys of the male frog. This ureter acts as a urinogenital duct which then opens into the cloaca. Whereas in females it is different the ureters and oviduct open separately in the cloaca. Frogs are called ureotelic animals because they excrete urea.
The excretory wastes are carried by the blood and then to the kidneys where it is separated and thrown out of the body through excretion. The nitrogen is excreted usually in the form of ammonia by tadpoles and aquatic frogs but mainly as urea which is less toxic.
Few species which have less access to water excrete less toxic uric acid. The urine is passed through a pair of ureters, a urinary bladder from which it is passed to the cloaca which is periodically vented out.
Hence the correct answer is option D, Cloaca.

Note: Each kidneys outer border in a frog has a fine transparent duct, which is known as a ureter in females and males; it is known as a urinogenital duct. These ureters run backward from the kidneys and then open to the cloaca, and then they carry urine from the kidneys to the cloacal chamber. The alimentary terminal portion is called the cloaca which receives genital products, fecal matters, and urine.