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Human Reproduction Test - 38

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Human Reproduction Test - 38
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  • Question 1
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    Which of the following structures contribute to secretion of semen?

    Solution
    Semen is an organic fluid, that usually contains spermatozoa. It is secreted by the sexual glands in males.
    The following structures are involved in semen production: 
    Structure marked C is testes, which produces 2 - 5% of semen released per ejaculation. 
    Structure marked G is seminal vesicle, which produces 65 - 75% of semen in the form of amino acids, citrate, enzymes, fructose, prostaglandins, proteins, and vitamin C. 
    Structure marked F is prostate gland, which produces 25 - 30% of semen in the form of acid phosphatase, citric acid, prostate specific antigen, proteolytic enzymes.
    Hence, the correct answer is option C.
  • Question 2
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    Which of the labelled part is involved in storage of sperms?

  • Question 3
    1 / -0
    The Leydig cells as found in the human body are the secretory source of
    Solution
    In human testes, each seminiferous tubule is made up of male germ cells (spermatogonia) and Sertoli cells  interstitial cell or leyding cells.  Leydig cells synthesise and secrete testicular hormones, called androgens. Thus, the correct answer is option B.
  • Question 4
    1 / -0
    What do the secretions from structure X cause?

    Solution
    The structure labeled as X is the corpus luteum, which is produced from leftover Graafian follicle after ovulation in the ovary. It secretes progesterone. Progesterone has multiple roles in establishing and prolonging the pregnancy so that the pregnancy lasts its full term. After ovulation, when progesterone concentration rises, the endometrium becomes thick.
  • Question 5
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    Identify the parts where meiosis occurs.

    Solution
    Urinary bladder (A) serves as site of storage of urine before its discharge. Testes (C) are the site of sperm production where germ cells of seminiferous tubules serve as primary spermatocytes. Primary spermatocytes undergo meiosis to produce four spermatids. Sperms are stored in epididymis (D) and are carried to vas deferens. Vasa deferens (B) is the tube connecting the epididymis to the urethra and serve to transport sperms to ejaculatory duct. 
  • Question 6
    1 / -0
    The sperm produces substance of enzymatic nature of sperm lysine. In mammals, it is called
    Solution
    During fertilization, hyaluronidase is released by the acrosome of the sperm cell once it has reached the oocyte, by digesting hyaluronan in the corona radiata, thus enabling conception. It is of lysine nature. Hence, the correct answer is option A.
  • Question 7
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    Which of the following part of spermatozoan arises from centriole?
    Solution
    Nucleus of spermatid becomes condense and dense and forms the head of the spermatozoa along with the acrosome. Apical cap is formed from the golgi complex. It contains lysosomal enzymes. Flagellum formation results in the formation of tail. The axonemal structure of flagellum arises from distal centriole. During spermatozoa development, the flagellum lies on the opposite side of the acrosome. 
    Thus, the correct answer is option D.
  • Question 8
    1 / -0
    Which piece of a sperm is called power house?
    Solution
    A human sperm is a microscopic structure composed of a head, neck, a middle piece and a tail. A plasma membrane envelops the whole body of sperm. The sperm head contains an elongated haploid nucleus, the anterior portion of which is covered by a cap-like structure, acrosome. The acrosome is filled with enzymes, that help fertilisation of the ovum. The middle piece possesses numerous mitochondria, which produce energy for the movement of tail that facilitate sperm motility essential for fertilisation. The human male ejaculates about 200 to 300 million sperms during a coitus.
  • Question 9
    1 / -0
    The concept that organizer is essential for embryonic development was given by
    Solution
    The Spemann-Mangold organizer is the Spemann organizer, which describes the cluster of cells in the developing embryo of an amphibian, that induces development of the central nervous system. The discovery of the Spemann-Mangold organizer introduced the concept of induction in embryonic development. So, the correct answer is option C.
  • Question 10
    1 / -0
    Release of mature spermatozoa from the Sertoli cells is called
    Solution
    During the production of sperms in the testes, the spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis. After spermiogenesis, mature spermatozoa are released from sertoli cells of the seminiferous tubules of testes by the process called spermiation. Semination is the process of deposition of sperms in the female genital tract. It can be natural or artificial, as in case of animal breeding procedures. Thus, the correct answer is option A.
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