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Human Reproduction · Question 78

AIPMT 2010 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(1) Oxytocin from maternal pituitary

Solution

As per NCERT, the signals for parturition originate from the fully developed foetus and the placenta, which induce mild uterine contractions called the foetal ejection reflex.

⇒ This triggers the release of oxytocin from the maternal pituitary.

⇒ Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulate further secretion of oxytocin, leading to expulsion of the baby.

∴ Parturition requires oxytocin from the maternal pituitary.

Answer: (1)

AIPMT 2010 (Mains)

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2

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)
3

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)
4

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)
5

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)
6

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)
7

The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

  1. Fourth month
  2. Fifth month
  3. Sixth month
  4. Third month
AIPMT 2010 (Prelims)
8

The second maturation division of the mammalian ovum occurs

  1. Shortly after ovulation before the ovum makes entry into the Fallopian tube
  2. Until after the ovum has been penetrated by a sperm
  3. Until the nucleus of the sperm has fused with that of the ovum
  4. in the Graafian follicle following the first maturation division
AIPMT 2010 (Prelims)
9

Which one of the following statements about human sperm is correct?

  1. Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation
  2. The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation
  3. Acrosome serves as a sensory structure leading the sperm towards the ovum
  4. Acrosome serves no particular function
AIPMT 2010 (Prelims)
10

Which one of the following statements about morula in humans is correct?

  1. It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA
  2. It has far less cytoplasm as well as less DNA than in an uncleaved zygote
  3. It has more or less equal quantity of cytoplasm and DNA as in uncleaved zygote
  4. It has more cytoplasm and more DNA than an uncleaved zygote
AIPMT 2010 (Prelims)
11

The part of Fallopian tube closest to the ovary is

  1. Isthmus
  2. Infundibulum
  3. Cervix
  4. Ampulla
AIPMT 2010 (Prelims)

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