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Human Reproduction Test - 51

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Human Reproduction Test - 51
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  • Question 1
    1 / -0
    A cell formed from cleavage is called
    Solution
    • Cleavage is the mitotic division of cells in the early embryo.
    • It starts in the zygote and forms 2,4,8,16 daughter cells called blastomeres.
    So, the correct option is 'Blastomere'.
  • Question 2
    1 / -0
    The female gamete is called 
    Solution
    • The female gamete is ova or ovum or egg. In humans, the ovum is produced by oogenesis. 
    • The vagina is the part of the reproductive system of the female where the blood lining of the uterus is shed, the baby descends, penis penetrates.
    • The ovary is the part of the reproductive system of females which contains follicles.
    • The uterus is the part of the reproductive system of females involves in the implantation and forms a branched lining of blood.
    So, the correct answer is option C.
  • Question 3
    1 / -0
    Which of the following hormones maintains the integrity of the uterine wall during pregnancy?
    Solution
    The corpus luteum secretes large amounts of progesterone which is essential for maintenance of the endometrium (wall of the uterus). Such an endometrium is necessary for implantation of the fertilized ovum. In the absence of fertilization, the corpus luteum degenerates which causes disintegration of the endometrium leading to menstruation, making a new cycle. Thus, the correct answer is option B.
  • Question 4
    1 / -0
    Spermatozoa are nourished during their development by 
    Solution
    • Sertoli cells are the supporting cells for spermatogenic cells (male germ cells) in seminiferous tubules.
    • Sertoli cells provide support, protection and nourishment to the developing spermatozoa (sperm).
    So, the correct option is 'Sertoli cells'.
  • Question 5
    1 / -0
    The process of formation of sperms is called
    Solution
    Spermatogenesis is the process by which spermatozoa or sperm cells are produced from spermatogonial stem cells through mitosis and meiosis. The spermatogonium(2n) undergoes mitosis to form primary spermatocytes(n). The primary spermatocytes divide meiotically to form the secondary spermatocyte (n) which further divide to from the spermatids(n). These spermatids mature to form the sperms(n). The ploidy of secondary spermatocytes is n(haploid). Thus the correct answer is option c. 

  • Question 6
    1 / -0
    The cells which provide nourishment for the germ cells.
    Solution
    Germinal cells and sertoli cells are produced in the seminiferous tubule of the testes. The function of sertoli cells is controlled by the FSH pituitary hormone. They are also called nurse cells as they provide nourishment to the developing spermatozoa. Thus the correct answer is option C.
  • Question 7
    1 / -0
    Embryo at 16-celled stage is called
    Solution
    After fertilization, at the end of the fourth day, the embryo reaches the uterus. It has 16 blastomeres and this solid mass of cells within the zona pellucida is called morula. It looks like a mulberry
    So, the correct answer is 'Morula'

  • Question 8
    1 / -0
    Eggs produced in a year by the two ovaries of a non-pregnant woman is
    Solution
    During the reproductive cycle of a human female. The menstrual cycle occurs every 28 days. Each cycle produces a single ovum, released from either of the ovaries. Since in an year there are twelve menstrual cycles. Therefore, 12  ova are produced.
    So, the correct answer is option A.
  • Question 9
    1 / -0
    An unfertilized human egg would have
    Solution
    The gametes are the haploid cells which are produced by the meiotic division. The egg is the female gamete which is produced through oogenesis. The gametes are haploid and contain only one set of the chromosome. So, the egg cell contains the 22 autosomes and one X chromosome. Since the female somatic cell contains two X chromosome, there will be only one X chromosome in the gamete.
    Thus, the correct answer is option B. 
  • Question 10
    1 / -0
    The hormone which induces spermatogenesis is
    Solution
    Follicle stimulating hormone (FSH) is the hormone released from the pituitary gland which stimulates the gonads to produce the gametes. The hormone is responsible for inducing the germinal cells of the seminiferous tubules to undergo spermatogenesis and produce sperms in males. 
    Thus, the correct answer is option B. 
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