Choose the incorrect match /characteristics
A. Hymen- Presence or absence of hymen is not a reliable indicator of virginity
B. Birth canal-Cervical canal along with vagina
C. Antrum-Tertiary follicle
D. Spermatogenesis- Sperm heads are released from sertoli cells.

Hint: Spermiation is the process by which mature sperm are released from Sertoli cells in the lumen of the seminiferous tubules before entering the epididymis. In some women hymen persists even after sexual intercourse. Antrum is a fluid filled cavity.

Complete answer:
> Option A: Hymen-
The hymen is a thin piece of mucosal tissue that surrounds or partially covers the outer opening of the vagina. It is part of the vulva, or external genitals, and has a structure similar to that of a vagina. The hymen can tear during the first intercourse, usually causing pain and sometimes slight bleeding or temporary spotting. The condition of the hymen is not a reliable indicator of virginity. In some women hymen persists even after sexual intercourse.
This statement one is correct.

> Option B: Birth canal-
Vagina is a tubular structure, extending from the cervix to the outside of the body. It receives sperm during intercourse, goes through menstruation and forms the birth canal along with the cervical canal during childbirth. The hymen is a membrane structure that covers the opening of the vagina, the opening of the vagina. The vagina is covered with stratified undigested squamous epithelium. There are no sweat glands in the walls of the vagina.

> Option C: Tertiary follicle-
Primary follicle when surrounded by more granulosa cells then it converts into secondary follicle. Secondary follicles soon transform into tertiary follicles which are characterised by a fluid filled cavity antrum , which appears between granulosa cells.
So the statement third is correct

> Option D: Spermiogenesis-
The process of transformation of spermatids that leads to the production of spermatozoa is known as Spermiogenesis . Since sperm are very active and motile cells, they must remove excess material from developing sperm in order to ensure true motility, and sperm undergo a high degree of specialization in several stages.
After Spermatogenesis the sperm head became embedded in sertoli cells and finally released from the seminiferous tubule by a process known as spermiation.

Hence, the incorrect statement is option (D).

Note:
• Vagina acts both as a copulation canal as it receives the sperms from the penis during copulation and as a birth canal along with cervix during parturition.
• Initially antrum is crescent shaped but with time it greatly enlarges.
• FSH acts on the sertoli cells and stimulates secretion of some factors which help in spermiogenesis.
• The hymen can be easily broken before a woman has sexual intercourse for the first time. Damage to the hymen does not mean that a woman has lost her virginity. Hymen can be broken by activities such as dancing, gymnastics, climbing trees or jungle gyms, horse riding, riding bicycles etc.