Which one of the following is the correct matching of the events occurring during menstrual cycle?

  • Ovulation - LH and FSH attain peak level and sharp fall in the secretion of progesterone

  • Proliferative - Rapid regeneration of myometrium and maturation of Graafian follicle

  • Development of corpus - luteum - Secretory phase and increased secretion of progesterone

  • Development of corpus - luteum - Secretory phase and increased secretion of progesterone


C.

Development of corpus - luteum - Secretory phase and increased secretion of progesterone

In secretory phase during ovulation, the follicle breaks and collapses under the continuous influence of Luteinizing Hormone (LH). It begins to enlarge and forms a yellowish structure, called the corpus luteum. The corpus luteum plays an important role in the preparation of the endometrium for the implantation of the fertilised egg by secreting oestrogens and progesterone.

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Cu ions released from copper -releasing Intra Uterine Devices (IUDs)

  • make uterus unsuitable for implantation

  • increase phagocytosis of sperms

  • suppress sperm motility 

  • suppress sperm motility 


A.

make uterus unsuitable for implantation

Intra- uterine device (IUD) is a small device made up pf copper, plastic or stainless steel. It is inserted into the uterus by a doctor and left in in place. It prevents implantation. iIt can be left in place for long periods. It may cause bleeding and discomfort. IUD may come out. 

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Foetal ejection reflex in human female is induced by 

  • the pressure exerted by the amniotic fluid

  • the release of oxytocin from pituitary

  • fully developed foetus and placenta

  • fully developed foetus and placenta


B.

the release of oxytocin from pituitary

Oxytocin (childbirth hormone) secreted by neurohypophysis of pituitary gland stimulates contraction of uterus muscles, including labour pain for child birth, when secretion of progesterone hormone declines, making the end of pregnancy. As the sensory impulse of increasing labour pain reaches hypothalamus, more and more oxytocin is released from posterior pituitary under a positive feedback regulation childbirth, it dilates the cervix (vaginal stretching).

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Given below is a diagrammatic sketch of a portion of the human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D.

  • A

    B

    C

    D

    Ureter

    Prostate

    Seminal  Vesicle

    Bulbourethral gland

  • A

    B

    C

    D

    Vas deferens

    Seminal vesicle

    Prostate

    Bulbourethral gland

  • A

    B

    C

    D

    Vas deferens

    Seminal vesicle

    Bulbourethral gland

    Prostate

  • A

    B

    C

    D

    Vas deferens

    Seminal vesicle

    Bulbourethral gland

    Prostate


B.

A

B

C

D

Vas deferens

Seminal vesicle

Prostate

Bulbourethral gland

A = Vas deferens,
B = Seminal vesicle
C = Prostrate 
D = Bulbourethral gland.

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The permissible use of the technique amniocentesis is for

  • detecting the sex of the unborn foetus

  • artificial insemination

  • transfer of embryo into the uterus of a surrogate mother

  • transfer of embryo into the uterus of a surrogate mother


D.

transfer of embryo into the uterus of a surrogate mother

Amniocentesis is a  technique for the diagnosis of congenital abnormalities before birth. By karyotypic studies of somatic cells, abnormalities due to change in chromosome number like Down's syndrome, Turner's syndrome, Klinefelter's syndrome, etc. can be determined.
It can be used as a pre- natal diagnostic technique. these days. amniocentesis is being misused also. Mothers even get their normal foetus aborted if it is a female.

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