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Human Reproduction · Question 69

AIPMT 2012 (Prelims)MCQMedium📈 Topic in 25% papers+4−1
1

Which one of the following statements is false in respect of viability of mammalian sperm?

  1. Viability of sperm is determined by its motility
  2. Sperms must be concentrated in a thick suspension
  3. Sperm is viable for only up to 24 hours
  4. Survival of sperm depends on the pH of the medium and is more active in alkaline medium

Answer

(3) Sperm is viable for only up to 24 hours

Solution

Viability of a sperm means its ability to fertilise the ovum, and it is judged by its motility.

∵ Sperms are kept concentrated in a thick suspension (semen) and remain active in the slightly alkaline medium of semen and the female tract, statements (1), (2) and (4) are correct.

∵ Human sperms remain viable in the female reproductive tract for about 48–72 hours, not only up to 24 hours (it is the ovum that remains viable for about 24 hours).

∴ Statement (3) is false.

Answer: (3)

AIPMT 2012 (Prelims)

Keep practising — Human Reproduction

2

Signals for parturition originate from :

  1. Placenta only
  2. Fully developed foetus only
  3. Both placenta as well as fully developed foetus
  4. Oxytocin released from maternal pituitary
AIPMT 2012 (Prelims)
3

In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was :

  1. High levels of FSH and LH in uterus to stimulate endometrial thickening
  2. High level of circulating HCG to stimulate estrogen and progesterone synthesis
  3. High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo
  4. High level of circulating HCG to stimulate endometrial thickening
AIPMT 2012 (Prelims)
4

The Leydig's cells as found in the human body are the secretory source of

  1. Glucagon
  2. Androgens
  3. Progesterone
  4. Intestinal mucus
AIPMT 2012 (Prelims)
5

What happens during fertilization in humans after many sperms reach close to the ovum?

  1. Only two sperms nearest the ovum penetrate zona pellucida
  2. Secretions of acrosome help one sperm enter cytoplasm of ovum through zona pellucida
  3. All sperms except the one nearest to the ovum lose their tails
  4. Cells of corona radiata trap all the sperms except one.
AIPMT 2011 (Mains)
6

About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occur?

  1. 11th day
  2. 14th day
  3. 20th day
  4. 5th day
AIPMT 2011 (Mains)
7

If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from :

  1. Vagina to uterus
  2. Testes to epididymis
  3. Epididymis to vas deferens
  4. Ovary to uterus
AIPMT 2011 (Prelims)
8

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for :

  1. providing a secondary sexual feature for exhibiting the male sex
  2. maintaining the scrotal temperature lower than the internal body temperature
  3. escaping any possible compression by the visceral organs
  4. providing more space for the growth of epididymis
AIPMT 2011 (Prelims)
9

The figure given below depicts a diagrammatic sectional view of the female reproductive system of humans. Which one set of three parts out of I-VI have been correctly identified? [Figure]

  1. (I) Perimetrium, (II) Myometrium, (III) Fallopian tube
  2. (II) Endometrium, (III) Infundibulum, (IV) Fimbriae
  3. (III) Infundibulum, (IV) Fimbriae, (V) Cervix
  4. (IV) Oviducal funnel, (V) Uterus, (VI) Cervix
AIPMT 2011 (Prelims)
10

Signals from fully developed foetus and placenta ultimately lead to parturition which requires the release of

  1. Oxytocin from maternal pituitary
  2. Oxytocin from foetal pituitary
  3. Relaxin from placenta
  4. Estrogen from placenta
AIPMT 2010 (Mains)
11

In human female the blastocyst

  1. gets implanted into uterus 3 days after ovulation
  2. gets nutrition from uterine endometrial secretion only after implantation
  3. gets implanted in endometrium by the trophoblast cells
  4. forms placenta even before implantation
AIPMT 2010 (Mains)

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