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Human Reproduction Test - 93

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Human Reproduction Test - 93
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following statement is correct?
    Solution
    Cleavage is the repeated mitotic division of the zygote. The cells of the zygote are covered by the zona pellucida layer, therefore, there is no increase in the size of the zygote.
    The repeated mitotic division of the zygote results in the formation of 8-16 celled structure which is morula.
    So, the correct option is 'Cleavage is repeated mitotic division of zygote.'
  • Question 2
    1 / -0
    Pattern of cleavage in egg of frog is
    Solution
    The frog egg contains a large amount of yolk and is telolecithal in nature. The egg is divided into two hemispheres: one is the animal pole and second is the vegetal pole.
    The nucleus and the yolk is concentrated in the animal pole.
    In the frog, the cleavage is of holoblastic unequal type because of a large amount of yolk present. It acts as a barrier in the division of the cells.
    So, the correct option is 'Holoblastic unequal'
  • Question 3
    1 / -0
    Secretions from which one of the following is rich in fructose, calcium and some enzymes
    Solution
    A.Correct option -A
    B.Explanation for correct option -A

    • Secretions from male accessory glands are rich in fructose, calcium and some enzymes.
    • The male accessory glands include paired seminal vesicles, prostate and paired bulbourethral glands.
    • Secretions of these glands constitute the seminal plasma which is rich in fructose, calcium and certain enzymes.
    • The secretions of bulbourethral glands also help in the lubrication of the penis.
    • Semen is the fluid mixture of spermatozoa and the secretions of these accessory glands, which comes through the urethra.
  • Question 4
    1 / -0
    During development which of the following organs is formed first?
    Solution
    During gastrulation, the 3 germ layers and the notochord is formed. The notochord is mesodermal in origin, it causes the ectoderm above it to roll and then form a plate-like structure known as the neural plate. The ectoderm then rolls over and forms a tube-like structure i.e the neural tube that settles below the ectoderm. This is the first organ that develops in the embryo. The neural tube develops into the brain and spinal cord.
    So, the correct option 'Neural tube'.
  • Question 5
    1 / -0
    Which of the following hormone is associated with the production of androgens?
    Solution
    ICSH stands for interstitial cell-stimulating hormone or LH hormone controls the Leydig cells that are responsible for the secretion of androgen or testosterone that stimulates the male reproductive character and also secondary sexual characters which includes facial and body hair growth and voice changes.
    So the correct option is 'ICSH'.
  • Question 6
    1 / -0
    Due to the presence of a large amount of yolk, the zygote divides into two incomplete halves. This type of cleavage does not occur in
    Solution
    • The cells with a large amount of yolk are known as the macrolecithal eggs. 
    • They have an incomplete cleavage because of more the amount of yolk, harder it is to divide the cell.
    • Reptiles and birds usually have the macrolecithal egg.

    • In amphibians, the yolk is less so the cleavage is complete which is also known as holoblastic cleavage.
    • Amphioxus is a member of the Cephalochordata group and it also has holoblastic, complete cleavage.

    So, the correct option is 'Amphioxus, Salamander and Rana'.
  • Question 7
    1 / -0
    Early embryonic developmental stages constitute
    Solution

    The first two weeks of development, which is a period of cell division and initial differentiation is called Early embryonic developmental stage. It also called prefunctional stages.

    So, the correct option is ‘Prefunctional state’
  • Question 8
    1 / -0
    Select the correct set of name for the parts A,B, C, D. 
     A Ureter Seminal vesicle Prostate Bulbourethral gland
     B Ureter Prostate Seminal vesicle  Bulbourethral gland
     C Vas deferens Seminal vesicle Prostate Bulbourethral gland
     D Vas deferens Seminal vesicle Bulbourethral glandProstate 

    Solution
    A is vasa deferens. It is one of the male sex accessory ducts. It forms the part of the path of sperm through the male body. From epididymis, the sperms lead to vas deferens that ascends to the abdomen and loops over the urinary bladder.
    B is seminal vesicle. The seminal vesicles are narrow, long pouches with muscular tissue in their wall, lying between the urinary bladder and rectum. Sugar fructose is present in the secretion of the seminal vesicle. Fructose is an energy source used by sperm. This fluid is known as semen. Sixty percent of semen is produced by seminal vesicles.
    C is prostate. The prostate gland is the accessory genital gland which occurs only in the male mammal. It is unpaired. It is located below the urinary bladder. It secretes an alkaline fluid. This fluid is rich in bicarbonate ion that neutralizes the acids in the female reproductive tract.
    D is bulbourethral gland. It is one of the male accessory glands. The bulbourethral gland is also called Cowper’s gland, is located in the membranous urethra, also opens into urethra and secrete clear mucus for lubrication and alkaline fluid that neutralizes the traces of acidic urine in urethra.
  • Question 9
    1 / -0
    Cleavage of Frog's egg is
    Solution
    Holoblastic cleavage is characterized by complete cleavage that divides the whole egg into distinct and separate blastomeres and observes when the egg has very less amount of yolk and is concentrated as observed in the frog.
    So the correct option is 'Holoblastic'.
  • Question 10
    1 / -0
    How many sperms are present in an average $$3$$ml ejaculation?
    Solution
    Ejaculation is the process of expulsion of semen during sexual intercourse forcefully. On an average (3 mL) ejaculation of semen contains about 300 million spermatozoa or sperms.
    So the correct option is '300 million'.
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