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Human Reproduction Test - 83

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Human Reproduction Test - 83
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  • Question 1
    1 / -0
    Identify the cell labelled 'A' in the T.S. of testis:

    Solution
    'A' - Sertoli cell - are the 'nurse cells' of the testicles as they take care of the process of spermatogenesis (i.e., the production of sperm). 
    Leydig cells are present outside the seminiferous tubule.
    The basement membrane is present at the outer lining of the seminiferous tubule.
    Sperm - formation takes place inside the seminiferous tubule and all the fresh free sperms are present inside the tubule.
    Therefore, the correct answer is 'Sertoli Cell'.
  • Question 2
    1 / -0
    Given below are events that lead to pregnancy and development of embryo.
    (i) Fertilization of egg
    (ii) Maturation of egg
    (iii) Release of egg
    (iv) Embedding of zygote in thickened uterine wall.
    Which of the following options gives the correct order of sequence in which they occur?
    Solution
    During the process of reproduction, the events that lead to pregnancy are as follows. 
    At puberty, the ovary releases a mature egg into the oviduct, this egg is fertilized by a sperm within the oviduct. After fertilization the egg forms the zygote. The zygote under goes divisions as it is pushed towards the uterus. The zygote in its 16 celled or 32 celled stage is embedded in the thickened uterine wall.
    So, the correct sequence is 'ii, iii, i, iv'
  • Question 3
    1 / -0
    Eggs are produced by which organ? 
    Solution
    Eggs are female gametes. They are produced by the primary sex organ ovary.
    So, the correct answer is '40 weeks'
  • Question 4
    1 / -0
    In the diagram of section of Graafian follicle, different parts are indicated by alphabets. Choose the answer in which these alphabets have been correctly matched with the parts they indicate.

    Solution
    The theca externa (A) is the outer layer of the graafian follicle. Theca interna, inner layer (B) cells express receptors for luteinizing hormone (LH) to produce androstenedione. A small sac, embedded in the ovary, that encloses an ovum (C). Cumulus oophorus (D) is a cluster of cells (called as cumulus cells) that surround the oocyte both in the ovarian follicle and after ovulation. The follicular antrum (E) is the portion of an ovarian follicle filled with follicular fluid. Graafian follicle consist of an external fibrovascular coat, connected with the surrounding stroma of the ovary by a network of blood vessels; and an internal coat, which consists of several layers of nucleated cells, called the membrana granulosa (F). 
    Therefore, the correct answer is option C.
  • Question 5
    1 / -0
    Name the hormone that has no role in menstruation.
    Solution
    LH (leutinizing hormone) - During proliferative phase, the estrogen increases and causes the suppression of FSH and increases the secretion of LH. Responsible for degeneration of most maturing follicles.
    FSH (follicle stimulating hormone) - Stimulates the follicles in the ovaries to grow.
    GH (growth hormone) - Some investigations suggests that there is an estrogen mediated rise in GH during the pre-ovulatory phase and luteal phase.
    TSH (thyroid stimulating hormone) - Stimulates thyroid gland to produce thyroid hormone, T3 and T4.
    So, the correct answer is 'TSH'
  • Question 6
    1 / -0
    $$2n=16$$ in a primary spermatocyte, which is in metaphase of first meiotic division. What shall be the total number of chromatids in each of the secondary spermatocytes?
    Solution
    Spermatogonium (2n) divides by mitosis and we get primary spermatocyte (2n) and by meiosis from one primary spermatocyte (2n), we get two secondary spermatocytes (n). Now, the number of chromosomes present in secondary spermatocyte is n and in one chromosome, there are two sister chromatids. So, if there are 16 chromosomes in primary spermatocyte, the secondary spermatocyte will have half the number, i.e., 8 chromsomes and the chromatids will be 8*2 = 16.
    Thus, the correct answer is option C.
  • Question 7
    1 / -0
    What is the female counterpart of prostate gland in the human male?
    Solution
    Bartholin's gland is homologous to bulbourethral gland in males. It secretes mucus and helps to lubricate the vagina.
    The prostatic utricle in males is homologous to uterus in females.
    Clitoris in females is homologous to penis in males.
    Skene's gland in females is homologous to prostate gland in males.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    If after ovulation no pregnancy results, the corpus luteum 
    Solution
    Progesterone is produced by the corpus luteum in the ovary. It prepares the endometrium (lining of the uterus) for the reception and development of the fertilized ovum. It also suppresses the production of estrogen after ovulation has taken place. During pregnancy, corpus luteum continue to produce progesterone. However, if pregnancy does not occur, corpus luteum starts disintegrating and the estrogen and progesterone levels fall suddenly on about 28th day and it results is the start of the menstrual cycle and the endometrium starts sloughing. Thus, the correct answer is the option (B), 'Degenerates in a short time'.
  • Question 9
    1 / -0
    Given is a diagrammatic sketch of a portion of human male reproductive system. Select the correct set of names of the parts labelled A, B, C, D.

    Solution
    The vas deferens is the muscular tube that travels from epididymis into the pelvic cavity to just behind the bladder.
    The seminal vesicle is a pair of exocrine glands that are located posterior to the urinary bladder and anterior to the rectum.
    The prostate gland is an exocrine gland that borders the urinary bladder and surrounds the urethra.
    The bulbourethral glands are located on the sides of urethra just below the prostate gland.
    Thus, the correct answer is option B.
  • Question 10
    1 / -0
    The elastic tissue connecting the cauda epididymis to the scrotal sac is ____.
    Solution
    Gubernaculum are embryonic structures which begin as undifferentiated mesenchyme and attaches to the caudal end of gonads to scrotal sac posteriorly.
    Tendinous cord is with respect to heart muscles.
    Scrotal ligament is the remnant of gubernaculum in a foetus.
    The caput epididymis is the head of epididymis which is the sperm storage area which wraps around the superior and posterior edge of testis.
    Thus, the correct answer is option A.
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