Question

The Cavity contained in Graafian follicle is
A. Antrum
B. Centrocoel
C. Blastocoel
D. Archenteron

Answer 1

Hint: The Graafian follicle is the follicular stage that appears after the first meiotic division but before the ovulation. It therefore contains a 2N haploid oocyte and is characterized by a large follicular antrum which makes up most of the follicle.

Complete answer:
> Option A - In biology, antrum is a term used for a cavity or chamber, which may have specific definition in reference to certain organs or sites in the body. The follicular antrum is an essential part of an ovarian follicle which is filled with follicular fluid. The Appearance of the follicular antrum during the process of follicular maturation is considered as an initial sign that proves that follicle has reached the next stage of maturation. Here it has changed from a primary follicle to a secondary follicle.

> Option B - Is in correct as Cavity contained in Graafian Follicle is Antrum.

> Option C - A blastocoel also spelled blastocoel and also called blastocyst cavities. It is a fluid-filled cavity that forms in the early amphibian as well as echinoderm embryos, or even in between the epiblast and hypoblast of avian.

> Option D - Archenterois a primitive digestive cavity of the embryo at the gastrula stage of development in animals.

Hence, the correct answer is option (A).

Note: During the time of primary oocyte completes its first meiotic division which results in the formation of secondary oocytes. Then the tertiary follicle further changes into mature follicle of Graafian follicle. Then the process is complete and it forms a new membrane called zona pellucida.