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Human Reproduction Test - 48

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Human Reproduction Test - 48
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  • Question 1
    1 / -0
    Atretic follicles are found in the
    Solution
    It is a follicle, that degenerates before coming to maturity; many atretic follicles occur in the ovary before puberty. Ovarian follicle atresia is the periodic process in which immature ovarian follicles degenerate and are subsequently re-absorbed during the follicular phase of the menstrual cycle. 
  • Question 2
    1 / -0
    The type of cleavage in a egg is determined by
    Solution
    Pattern of embryonic cleavage is determined both by the position of the mitotic spindles and by the amount and distribution of yolk. Yolk tends to inhibit cleavage. It slows it down or actually prevents complete cleavage. Yolk is an adaptation of those animals that go through more or less of embryogenesis isolated from any food supply. 
  • Question 3
    1 / -0
    Sperms travel during an ejaculation from the ---(i)-----, where they are stored to the ----(ii)----, from where they are transported to the ejaculatory duct and then to the ----(iii)----, which carries both reproductive and excretory fluids. A vasectomy is a surgical procedure for contraceptive purposes in which the ----(iv)---- is cut and blocked so as to prevent sperms from being present in the semen. 

    Select the correct sequence of terms to complete the above paragraph.
    Solution
    • The epididymis is part of the male reproductive system which collects sperm from testes and stores.
    • The vas deferens are the duct that transports sperm from the epididymis to the ejaculatory ducts in anticipation of ejaculation.
    In the human male, the urethra opens at the end of the penis. The urethra provides an exit for urine as well as semen during ejaculation.
    • Vasectomy is a surgical treatment where the vas deference is sealed or tied to block the passage of sperms which helps to prevent fertilization.

    Therefore, the correct answer is option C.
  • Question 4
    1 / -0
    The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testes is
    Solution
    Spermatogenesis is the process which takes place in the testes and involved in the production os the sperms. The germ cells or spermatogonia divide mitotically to yield primary spermatocyte which divides meiotically into two secondary spermatocytes. Each of the secondary spermatocytes divides into two spermatids by meiosis II. These develop into mature sperm cells.
    Therefore, the correct answer is option A.
  • Question 5
    1 / -0
    Which of the following is not a part of female reproductive system?
    Solution
    • The ovary is a female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair.
    • The oviduct is the tube through which an ovum is conducted from the ovary towards the uterus for fertilization and then implantation. 
    • The uterus is a sac-like structure, also called the womb that provides an environment for the development of the foetus. 
    • So, all these three are parts of the female reproductive system.
    • On the other hand, the embryo is an unborn offspring in the process of development after fertilisation.
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    In which female reproductive organ does the embryo get embedded?
    Solution
    • The process in which the embryo gets embedded in the uterine wall is called implantation. 
    • Embryo gets implanted at the blastocyst stage. It is by this adhesion, that the fetus receives oxygen and nutrients from the mother and is able to grow.

    Thus, the correct answer is option (A).

  • Question 7
    1 / -0
    Loss of reproductive capacity in women after age of 45 years is 
    Solution
    Menopause is the time in a woman's life when her menstrual periods stop and she is no longer able to have children (i.e., no longer fertile), which generally happens after the age of 40-45 years.
    Menstruation is the woman's monthly cycle, menarche is the first menstrual period and ageing is the general phenomenon of growing old.

  • Question 8
    1 / -0
    Chromosomes in primary sex cell is
    Solution
    The germ cells are diploid in nature, which on meiotic division produces primary spermatocyte which is diploid in nature. Thus, the correct answer is option B.

  • Question 9
    1 / -0
    Hormone which controls spermatogenesis is 
    Solution
    At puberty, the hypothalamus begins to secrete gonadotropin-releasing hormone (GnRH). GnRH stimulates the anterior pituitary to secrete the gonadotropic hormones follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Both FSH and LH are glycoproteins that use cyclic AMP as a second messenger. FSH stimulates Sertoli cells to secrete androgen-binding protein (ABP) and other signaling molecules that are necessary for spermatogenesis. LH stimulates the interstitial cells to secrete testosterone. 
    So, the correct answer is option A.
  • Question 10
    1 / -0
    The cleavage which cleaves the egg partially is
    Solution
    In meroblastic cleavage, only a portion of the egg divides, which is partial cleavage. This is because of the large amount of yolk in the egg cell, that the cleavage furrows do not penetrate the yolk. Two types of meroblastic cleavage are found - discoidal and superficial cleavage. It is visible in birds and reptiles. 
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