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Human Reproduction Test - 31

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Human Reproduction Test - 31
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  • Question 1
    1 / -0
    Which hormone level reaches peak during luteal phase of menstrual cycle?
    Solution
    correct answer is option B.
    The luteal phase is the latter phase of the menstrual cycle. It starts with the formation of corpus luteum and ends in either pregnancy or luteolysis. After ovulation, the FSH and LH causes the remaining parts of the follicle to transform into corpus luteum. It grows for some time after ovulation and produces significant amount of progesterone.

  • Question 2
    1 / -0
    In the ovum of rabbit, Graafian follicle has
    Solution
    In rabbit, the oocyte forms several layers of follicle cells. The stroma of the ovary is surrounded by the follicular epithelium which develops into a connective tissue layer (called theca), which is differentiated into a glandular and estrogen-synthesizing layer called theca interna and the external layer called theca externa. Thus, the correct answer is option D.
  • Question 3
    1 / -0
    The rupture of the Graafian follicle and the release of ovum occurs under the influence of which hormone? 
    Solution
    Leutenizing hormone or LH is produced by the pituitary gland in the brain. It stimulates the ovaries to produce oestrogen and progesterone. It triggers ovulation, which is the release of a mature ovum from the ovary and it promotes the development of corpus luteum by rupture of Graafian follicle.
    Thus, the correct answer is A.
  • Question 4
    1 / -0
    Which one of the following is the correct matching of the events occurring during menstrual cycle?
    Solution
    Correct option: C

    Explanation: 
    • Development of corpus luteum takes place in secretory phase with increased secretion of progesterone.
    • During ovulation, both LH and FSH attain a peak level in the middle of cycle, And graafian follicle ruptures releasing the ovum.
    • The endometrium becomes thicker and regenerated due to FSH and estrogen levels in the blood during Proliferative phase. 
    • The endometrium of the uterus breaks down and menstruation begins in Menstrual Phase.
      Thus, Option C is correct.
  • Question 5
    1 / -0
    The cyclic period of sexual activity in non-human female mammals is called as
    Solution
    The estrous cycle is the reproductive cycle induced by the reproductive hormones estrous in most non-primate mammalian females. There are four phases in the eutrous cycle: proestrus, estrus, metestrus and diestrus. Oogenesis is the process of formation of the ovum. Menstruation is the first phase of the menstrual cycle in primates. Luteinization is the process of development of ovarian follicle.
    Thus, the correct answer is option D.
  • Question 6
    1 / -0
    In mammals, the oestrogens are secreted by the Graafian follicle from its 
    Solution
    The Graafian follicle is a mature fluid-filled cavity within which an ovum develops before the ovulation. Once the ovarian follicle gets a ruptured, the theca interna cells differentiate into the theca lutein cells of the corpus luteum and secrete estrogen.
    Thus, the correct answer is option B.
  • Question 7
    1 / -0
    In the human female, menstruation can be deferred by the administration of ________. 
    Solution
    Correct option: C

    Explanation:
    • In Human females, menstruation can be deferred by the administration of combination of estrogen and progesterone. This combination in blood leads to stoppage of shedding uterine endometrium.
    • Estrogen decreases the release of FSH by negative feedback on the pituitary gland and inhibits follicular development and preventing ovulation. Estrogen also reduces the incidence of irregular breakthrough bleeding. 
    • Progesterone and estrogen maintain the lining of uterus throughout the pregnancy. It also aids in implantation of foetus into the uterine wall.
    • These also regulate menstrual cycles and prepare the uterus for fertilization in secretory phase.
      Thus, Option C is correct.
  • Question 8
    1 / -0
    In the 28 days human ovarian cycle, the ovulation takes place typically on 
    Solution
    FSH is secreted by anterior pituitary during the follicular phase (day 0 to 10) and stimulates the development of follicle. LH surge at day 14 causes rupture of Graffian follicle and release of the ovum. Day 15 to 28 constitute secretory phase marked by secretion of progesterone and estrogen from corpus luteum. Thus, the correct answer is option C.
  • Question 9
    1 / -0
    Embryonic body form stage is characterised by 
    Solution
    In the embryonic developmental stage, an embryo develops within the amniotic sac, under the lining of the uterus. This stage is characterized by the formation of most internal organs and external body structures. It is also characterized by the stage of development resembling other species. 
    So, the correct answer is option C.
  • Question 10
    1 / -0
    The branch of embryology, which concerns with the study of abnormal embryonic development is termed as 
    Solution
    Gerontology is the study of social, psychological and biological aspects of aging.
    Teratology is the science that studies about the mechanisms, and patterns of abnormal development.
    Embryology is the study of development of an embryo.
    Thus, the correct answer is option B.
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