Test: Spermatogenesis - NEET MCQ

As male attain puberty. Leydig cells surrounding seminiferous tubules start to secrete testosterone hormone which initiate Spermatogenesis in Seminiferous tubules.

Topic in NCERT: GAMETOGENESIS

Line in NCERT: "Androgens, in turn, stimulate the process of spermatogenesis."

A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each.

Line in NCERT: "The primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each."

Secondary oocyte: The secondary oocyte is the cell that is formed by meiosis I in oogenesis. Thus, it has only one of each pair of homologous chromosomes

Line in NCERT: "the secondary spermatocytes, which have only 23 chromosomes each."

Both Ovum and Sperm have haploid content 

Line in NCERT: "The primary sex organs - the testis in the males and the ovaries in the females produce gametes, i.e, sperms and ovum, respectively, by the process called gametogenesis."

Sertoli cells provide nutrition to the germ cells.

Line in NCERT: "Sertoli cells provide nutrition to the germ cells."

Human sperm is haploid cell have flagellated tail like structure for movement.

Line in NCERT: "Each spermatogonium is diploid and contains 46 chromosomes."

The middle piece possesses numerous mitochondria, which produce energy for the movement of tail that facilitates sperm motility essential for fertilisation.

Line in NCERT: "The middle piece possesses numerous mitochondria, which produce energy for the movement of tail that facilitate sperm motility essential for fertilisation."

• Spermatogenesis is the process of the production of sperms from spermatogonia in the testis.
• Puberty is the time of onset of this process.

Line in NCERT: "The process of spermatogenesis that begins at puberty."

Spermiation is the process by which mature spermatids are released from Sertoli cells into the seminiferous tubule lumen prior to their passage to the epididymis. It takes place over several days at the apical edge of the seminiferous epithelium, and involves several discrete steps including remodelling of the spermatid head and cytoplasm, removal of specialised adhesion structures and the final disengagement of the spermatid from the Sertoli cell.

Semination is the deposit of seminal fluid within the vagina or cervix. Insemination is the introduction of sperm into a female's reproductive system for the purpose of impregnating. Ejaculation is the expulsion of semen from the body.

Line in NCERT: "The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation."

Acrosome derived from Golgi body and have enzyme for sperm penetration.

Line in NCERT: "The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma."

Meiosis II is Equational division 

Line in NCERT: "The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids."

The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis.

Line in NCERT: "The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis."

Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid
spermatids 
 

Line in NCERT: "The spermatogonia (sing. spermatogonium) present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids."

LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis. FSH acts on the Sertoli cells

Line in NCERT: "LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis."

The maturation of human sperm occurs in the Epididymis. Option 2 is the correct answer. The epididymis is a coiled tube located at the back of each testicle, where sperm undergo the final stages of maturation, become more motile, and gain the ability to fertilize an egg.

Line in NCERT: "Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for maturation and motility of sperms."