Question

Graafian follicles occur in
A. Ovary
B. Testis
C. Egg
D. Sperm

Answer 1

A mature stage of the follicle, which is attached to the wall of an organ present in the female reproductive system. It is spherical in shape and it contains the female gamete known as an oocyte. In other words, it is the covering that surrounds the oocyte.

Complete answer:
The ovary is a part of the female reproductive system where the process of ovulation (when a mature egg is released from the ovary) takes place. This released egg if fertilized with the sperm forms the embryo but if it is not fertilized then it leads to menstruation.
The Graafian follicle is the covering that surrounds this egg or oocyte( female sex gonad). It has a fluid-filled cavity known as Antrum and a layer of follicular cells which are known as cumulus oophorus.

Most follicles, however, will not undergo ovulation but will simply degenerate; forming the corpus luteum in most mammals followed by corpus Albicans.
Follicle growth is under the influence of the pituitary gland.
The hormone released by the Graafian follicle is estrogen in the ovary which is a female sex hormone.
Other parts of the female reproductive system in mammals-

Ovaries
Fallopian tubes
Uterus
Vagina
Accessory glands
Genital organs

The Graafian follicle is a mature spherical vesicle that is filled with fluid and is present in the ovary of a mammal containing the oocyte. So, option ( A ) is correct.

Additional information: Testis is a part of the male reproductive system and the sex gonad produced by it is sperm which upon fertilization with female sex gonad, Egg, or Oocyte, forms the offspring.

Note: A cavity first appears amongst follicle cells surrounding the egg, around the end of the period of cytoplasmic growth of the oocyte.
In mammals with, it enlarges during the early part of the cycle, so that follicle cells separate into two layers, one inside theca internal and the other an external layer, theca externa, until the follicle bursts on to the surface of the ovary, discharging the oocyte (ovulation).
While solving this type of question try to recall the diagram and the processes involved in each organ of that diagram. Don’t get confused between reproductive systems and their respective sex gonads.