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Human Reproduction · Question 73

AIPMT 2011 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

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.

Answer

(2) Secretions of acrosome help one sperm enter cytoplasm of ovum through zona pellucida

Solution

As per NCERT, the secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida and the plasma membrane.

⇒ Only one sperm fertilises the ovum: as soon as a sperm contacts the zona pellucida, it induces changes in the membrane that block the entry of additional sperms.

∴ Two sperms never enter, other sperms do not lose their tails, and the corona radiata does not trap them.

Answer: (2)

AIPMT 2011 (Mains)

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2

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)
3

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)
4

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)
5

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)
6

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)
7

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)
8

Secretions from which one of the following are rich in fructose, calcium and some enzymes?

  1. Liver
  2. Pancreas
  3. Salivary glands
  4. Male accessory glands
AIPMT 2010 (Mains)
9

Sertoli cells are found in :

  1. ovaries and secrete progesterone
  2. adrenal cortex and secrete adrenaline
  3. seminiferous tubules and provide nutrition to germ cells
  4. pancreas and secrete cholecystokinin
AIPMT 2010 (Prelims)
10

Vasa efferentia are the ductules leading from :

  1. Testicular lobules to rete testis
  2. Rete testis to vas deferens
  3. Vas deferens to epididymis
  4. Epididymis to urethra
AIPMT 2010 (Prelims)
11

Seminal plasma in human males is rich in

  1. fructose and calcium
  2. glucose and calcium
  3. DNA and testosterone
  4. ribose and potassium
AIPMT 2010 (Prelims)

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