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Human Reproduction Test - 65

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Human Reproduction Test - 65
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  • Question 1
    1 / -0
    Production of sperms from spermatids is
    Solution
    Production of sperms from spermatids is spermiogenesis. It is the last stage of spermatogenesis. It occurs in testis and begins at puberty. The spermatids are transformed into sperms by the process of metamorphosis. Sperms are also known as spermatozoa. After spermiogenesis, the sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.
  • Question 2
    1 / -0
    Nutritive cells of seminiferous tubules are
    Solution
    Nutritive cells of seminiferous tubules are Sertoli cells. Sertoli cells are found in the germinal epithelium of seminiferous tubules. Sertoli cells are also known as nurse cells. They provide nutrition to spermatozoa. Spermatozoa are developing sperms. Heads of spermatozoa are embedded in the sertoli cells. Sertoli cells also secrete called inhibin which suppresses FSH synthesis.
  • Question 3
    1 / -0
    Choose the correct combination for labelling of part of seminiferous tubule.

    Solution
    • The interstitial cells are present in between the seminiferous tubules.
    • The spermatogonium cells are the ones that divide by mitosis and then some of the cells increase in size to form the primary spermatocyte.
    • The Sertoli cells are the nurse cells that nourish the sperm
    • The primary spermatocyte undergoes meiosis to form 4 spermatids. these spermatids mature and forms spermatozoa. 

    So, the correct option is 'a-interstitial cell, b-spermatogonium, c-spermatid, d-spermatozoa, e-sertoli cell'

  • Question 4
    1 / -0
    Cytoplasm of ovum does not possess
    Solution
    • Ovum or secondary oocyte where the second meiotic division is yet to occur. The cytoplasm of the ovum is known as ooplasm. It contains lipoproteins, pigment granules, UNA, water and other cytoplasmic organelles.  It does not contain centrosome as centrosome helps in meiotic cell division which has already started. 
    So, the correct option is 'centrosome'.

  • Question 5
    1 / -0
    In the urinogenital system one of the following part is present in males and not in females.
    Solution
    Urethra, fallopian tube and vagina all are a part of the urinogenital system of the females whereas vas deferens is a part of the urinogenital system of the males.
    The vas deferens is a long tube that carries the sperm from the testes to the penis.
    So, the correct option 'Vas deferens'
  • Question 6
    1 / -0
    LH surge occurs during
    Solution
    Menstrual cycle starts with the menstrual flow (menses), this is followed by follicular phase. During this phase secretion of gonadotropins  (LH and FSH) and estrogens. In the middle of the cycle, rapid secretions of LH and FSH increases leading to LH surge and hence ovulation. Ovum lasts for 24 hours only. It is followed by the luteal phase during which the remaining parts of Graafian follicle changes into corpus luteum.
    So, the correct option is 'At the middle of the cycle'.
  • Question 7
    1 / -0
    Function of Sertoli cells is controlled by
    Solution
    Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropins. This increases secretion of LH and FSH. LH acts at leydig cells and stimulates synthesis and secretion of androgens, which in turn stimulate the process of spermatogenesis. FSH acts on sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis.
    So, the correct option is 'FSH'.
  • Question 8
    1 / -0
    Which of the following is the correct sequence in embryo development?
    Solution
    The zygote is the first cell that forms after fertilization. This zygote undergoes rapid mitotic divisions known as the cleavage. 
    The cleavage results in the formation of an 8-16 cell structure known as the morula.
    Blastulation is the next step that leads to the formation of blastula from the morula. The blastula has two type of cells, outer trophoblast and the inner cell mass and a cavity known as blastocoel.
    Morphogenetic movements take place in this blastula and form a gastrula and this is known as the gastrulation. The cavity of gastrula is known as the archenteron.
    So, the correct option is 'Cleavage, blastulation, gastrulation'
  • Question 9
    1 / -0
    Process of the maturation of spermatids into spermatozoa is known as
    Solution
    Spermiogenesis is the process of maturation of spermatids into the spermatozoa. The spermatids are more of a circular structure which contains the nucleus, Golgi body, and the mitochondria.
    Spermatogenesis is the process of formation of spermatids from the primordial germ cells.
    Spermiation is the release of mature spermatids from the Sertoli cells.
    Oogenesis is the process of formation of female gamete ovum.
    So, the correct option is 'Spermiogenesis'
  • Question 10
    1 / -0
    Spermatogenesis is formation of
    Solution
    Spermatogenesis is the process of formation of the sperms (the male gametes). It takes place in the seminiferous tubules of the testis. Germinal epithelium which lines the seminiferous tubules proliferate and then undergoes mitosis and meiosis, therefore from one primary spermatocyte four sperms are produced. This process usually takes up around 72-74 days. Spermatogenesis takes place throughout the life cycle of the males. So, the correct option is 'Sperm'.
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