Question

In Frog, cloacal aperture is used for elimination of
Option A- Urine
Option B- Gametes
Option C- Faecal matter
Option D- All the above

Answer 1

Hint: The posterior opening in on the body of vertebrates such as birds, reptiles, fish, and amphibians. It helps in functioning important functions of the body. It is not found in placental mammals and most bony fishes.

Complete answer:
Cloacal aperture is the opening of the cloaca through this opening urine, undigested food, eggs, and sperms are passed away. It is not found in placental mammals and most bony fishes. At one point when the human embryo is developing there is this cavity called cloaca but later it divides to form the bladder, rectum and genitals.

Option A- Urine: The ureters act as urogenital duct that opens into the cloaca. The thin walled urinary bladder that is present ventral to the rectum also opens in this and helps as a passageway for urine.

Option B- Gametes: In fish, birds and amphibians cloacal aperture serves as a common exit for faecal matter, urine and gametes. Male and female frogs both have this aperture with their respective reproductive tract as a passway for sperms and eggs.

Option C- Faecal matter: The undigested food is also passed by cloacal aperture so it is exited for faecal matter also.

So our correct answer is Option D- All the above.

Note:
The frog cloaca is a short simple tube receiving genital and urinary tracts,rectum and the allantoic bladder. Female cloaca has additional mullerian ducts than the male one. The mullerian ducts differentiate to form fallopian tubes, uterus, uterine cervix and vagina and many malformations can occur if this system is disrupted.