Question

Which of the following ovary and oviduct are functional in birds?
a. Left
b. Right
c. Right ovary, left oviduct
d. Right ovary, both oviducts

Answer 1

Hint: The reproductive system of aves is designed in such a way, to accommodate the risk associated with being a bird, as we know that birds themselves are prey, they require a unique reproductive system, for their ability to fly.

Complete answer:
- Parts of the female reproductive system.
- Before entering into the reproductive parts, the important point to be noted is that in almost all birds only the left ovary and left oviduct is functional.
- Generally, during the development of the embryo, both the ovaries are present, as they grow, the right ovary undergoes regression and it becomes non functional in the adults.
- Ovary: They are nothing but the developing ova, which are usually present as clusters, and they are situated at the neck and the tail of the bird and attach to the back.
- Oviduct: when ovulation occurs, the ovum is released into the oviduct and it is coiled like structure and it is majorly divided into five parts namely, infundibulum, which is the first part of oviduct, where the ovum is engulfed by it.
- The second part of the oviduct is Magnum, as the name implies, it is the largest part and ovum stored here for some time.
- The third part of the oviduct is isthmus, where it connects the inner part of the shell with the outer part.
- The last part of the oviduct is vagina, it is helpful for laying the eggs.

Hence, the correct answer is option (A).

Note: The most important point, one should remember is that in birds, mainly to adapt the body for flying, all changes are happen and the bones are also hollow and light weight, For this reason only left ovum and oviduct is only working and the other side is regressed.