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Human Reproduction Test 3

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Human Reproduction Test 3
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  • Question 1
    1 / -0

    Corpus luteum in mammals occurs in:

    Solution

    • The corpus luteum is a temporary endocrine structure in female mammals, that is involved in the production of high amounts of progesterone.
    • The corpus luteum develops from an ovarian follicle present in the ovary during the luteal phase of the menstrual cycle. Once, the secondary oocyte is released from the follicle during ovulation, it results in the formation of corpus luteum.

    Corpus Lectum:

  • Question 2
    1 / -0

    Cervix is a part ______.

    Solution

    ► Cervix: The cervix is the lowest part of the uterus. It’s lined with a smooth mucous membrane and connects the uterus to the vagina. Glands in the cervical lining usually produce a thick mucus. However, during ovulation, this becomes thinner to allow sperm to easily pass into the uterus.

    ► The cervix has three main parts:
    Cervical cells, ectocervix, endocervix | Ectocervix, Cervix uteri, Squamous  cell
    1. Endocervix: This is the inner part of the cervix that leads to the uterus.

    2. Cervical canal: The cervical canal links the uterus to the vagina.

    3. Exocervix: The exocervix is the outer part of the cervix that protrudes into the vagina.

  • Question 3
    1 / -0

    In which part of sperm are mitochondria present?

    Solution

    Mitochondria is present in the middle piece of sperm. It provides energy to sperm movement by producing energy rich compounds like ATP.

    Structure of Sperm:
    Gametes | Class 8, Reproduction in animals

  • Question 4
    1 / -0

    Acrosome is made up of:

    Solution

    • The acrosome is the part on the head of the sperm.
    • It releases acrosin & is located on the tip and it is made of chemicals to dissolve the membrane of the egg so that it can fertilize it.
    • It is formed with the help of golgi bodies / golgi apparatus.

  • Question 5
    1 / -0

    Seminal plasma, the fluid part of semen is contributed by:
    (i) Seminal vesicle
    (ii) Prostate
    (iii) Urethra
    (iv) Bulbourethral gland​

    Solution

    • Seminal plasma is the fluid part of semen and is contributed by seminal vesicles, prostate gland and bulbourethral glands. Seminal vesicles contribute fructose, citric acid and other nutrients as well as fibrinogen and prostaglandin.
    • Secretions from prostate gland contain calcium ions, phosphate Ion, etc. and are alkaline in nature.
    • Bulbourethral glands secrete alkaline mucus which is important for the lubrication of penis.

    So, the correct answer is '(i), (ii) and (iv)'.

  • Question 6
    1 / -0

    The secondary sexual characters develop in females because of:

    Solution

    Estrogen is responsible for the developement of female secondary sexual characters. Progesteron is the pregnancy harmone.

  • Question 7
    1 / -0

    The cleavage divisions in humans is:

    Solution

    The process of cleavage or cellulation happens through repeated mitotic divisions. These divisions result in cells called blastomeres. The mitotic process is very rapid. As the cleavage progresses the resultant daughter cells, namely the blastomeres get reduced in size. During cleavage, there is no growth in the blastomeres. The total size and volume of the embryo remain the same. The cleavages result in a compact mass of blastomeres called morula. It gets transformed into a blastula. While the wall of the blastula is called the blastoderm, the central cavity is called the blastocoel. Types of cleavages:
    Equal holoblastic cleavage - In microlecithal and isolecithal eggs, cleavage leads to the formation of blastomeres of equal size. Eg: Amphioxus and placental mammals.
    Unequal holoblastic cleavage - In mesolecithal and telolocithal eggs, cleavage leads to the formation of blastomeres of unequal size. Among the blastomeres, there are many small-sized micromeres and a few large-sized macromeres.

  • Question 8
    1 / -0

    The testes are situated outside the abdominal cavity within a pouch called scrotum. This is necessary as:

  • Question 9
    1 / -0

    Each seminiferous tubule is lined on its inside by:

  • Question 10
    1 / -0

    Leydig cells:

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