Question

Only one ovary is present in the
A. Aquatic reptiles
B. Terrestrial reptiles
C. Birds
D. Egg laying mammals

Answer 1

Hint: The ovary's major role, similar to that of mammals, is to produce eggs and steroid hormones. In contrast to mammals, most bird species only have one functional ovary and oviduct. Both oviducts are present and functioning in several species of birds of prey. The ovary is a female reproductive organ that produces an egg called an ovum.

Complete answer:
Ovaries are usually two in number in all female creatures, with the exception of birds (Class Aves), which have a single left ovary. This reduces the weight of the aircraft, which is necessary for flying.In birds, only the left ovary and oviduct are present, which is an adaptation for flying.

As a result, the right response is option C 'Birds'.

Most adult birds have only one ovary and oviduct, which are not located in the midline. The solitary ovary is located on the bird's left side, attached to a large oviduct that transports eggs to the midline cloaca - yes, most birds have a cloaca, which serves as a single outflow for urine, faeces, and eggs.
Adult male birds are able to fly, yet they have tested on both sides of their bodies. Even during the breeding season, when the testes increase in mass significantly, the solitary ovary is comparable in size to the testes. Perhaps both factors impact why the ovary is lost — weight loss for flight and egg damage prevention.
Only the left ovary and oviduct are functional in practically all bird species, including poultry. Only the left ovary develops in the female embryo, despite the fact that the female embryo has two ovaries. During development, the right one usually regresses and becomes nonfunctional in adult birds.

Note:-
The onset of ovulation appears to be influenced by hormones. Luteinizing hormone is a hormone that activates the. Prostaglandins are produced by the ovarian follicles. The follicular stigma may benefit from prostaglandins. to burst, allowing ovulation to take place. NHS ovarian cyst
On the ovary, an ovarian cyst is a fluid-filled sac that forms. They're extremely prevalent and normally don't create any symptoms.