Sequentially arrange the developmental stages of human spermatozoon :
(A) Secondary Spermatocyte
(B) Spermatid
(C) Spermatozoa
(D) Spermatogonia
(E) Primary spermatocytes
Choose the correct answer from the options given below :
(A) Secondary Spermatocyte
(B) Spermatid
(C) Spermatozoa
(D) Spermatogonia
(E) Primary spermatocytes
Choose the correct answer from the options given below :
(E), (A), (D), (B), (C)
(E) (A), (D), (C), (B)
(E), (A), (C), (D), (B)
(D), (E), (A), (B), (C)
The Correct Option is D
Solution and Explanation
Spermatogenesis involves the creation of sperm in males, occurring within the seminiferous tubules located in the testes. During this process,
(a) Spermatogonia, located on the inner wall of the seminiferous tubules, undergo mitotic division, resulting in an increase in their numbers.
(b) Every spermatogonium is diploid, housing a total of 46 chromosomes.
(c) Spermatogonia that periodically undergo meiosis are termed primary spermatocytes.
(d) When a primary spermatocyte undergoes the first meiotic division, it results in the formation of two equal, haploid cells known as secondary spermatocytes, each containing only 23 chromosomes.
(e) Secondary spermatocytes proceed to undergo the second meiotic division, giving rise to four equal, haploid spermatids.
(f) Spermatids are transformed into spermatozoa (sperms) through the process known as spermiogenesis.
Now, let's see the diagram :
Hence, the correct sequence of spermatogenic stages culminating in the formation of sperm in a mature human testis is:
Spermatogonia - Primary spermatocytes - secondary spermatocytes - spermatids - spermatozoa
So, the correct option is (D) : (D), (E), (A), (B), (C).
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Concepts Used:
Human Reproduction
Reproduction in human beings involves the fusion of male and female gametes that produces in their reproductive system.
Male Reproductive System:
The male reproductive system comprises:
- Testicles (testes): A pair of oval-shaped organs masked in a pouch known as the scrotum. They manage the production of sperms and the male hormone testosterone.
- Scrotum: It is a sac-like organ that hangs under the penis and behind it. It is the house of the testes, or testicles, and maintains a temperature that is needed for the production of sperm by it.
- Vas deferens: The sperms produced in testes are stored in a tube known as the epididymis. Here the sperms get matured and pass to the urethra via the muscular tube known as vas deferens.
- Accessory glands: This includes three glands, namely the prostate gland, seminal vesicles, and Cowper’s gland. The secretions from the mentioned three glands mix to form a fluid known as semen. Semen nourishes the sperm, raises the volume, and helps in lubrication.
- Penis: The penis is a cylindrical tube that serves as both an excretory organ, and a reproductive organ. It transfers sperms into the vagina during sexual intercourse.
Female Reproductive System:
The female reproductive system is active before, during, and after fertilization as well. It comprises the following parts:
- A pair of ovaries: A pair of ovaries produce and stores ovum in them. They also produce a female hormone known to be estrogen.
- Fallopian tubes (Oviducts): They are the area of fertilization. They connect both the ovaries with the uterus.
- Uterus: Uterus is the place of development for the embryo.
- Vagina: The part that connects the cervix to the external female body parts is called a vagina. It is the passage for the penis during coitus as well as a fetus during transfer.
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