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Human Reproduction · Question 92

AIPMT 2009MCQEasy📈 Topic in 25% papers+4−1
1

Foetal ejection reflex in human female is induced by

  1. Pressure exerted by amniotic fluid
  2. Differentiation of mammary glands
  3. Release of oxytocin from pituitary
  4. Fully developed foetus and placenta

Answer

(4) Fully developed foetus and placenta

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 reflex then triggers the release of oxytocin from the maternal pituitary, which causes stronger uterine contractions (so oxytocin release is a result, not the inducer).

Answer: (4)

AIPMT 2009

Keep practising — Human Reproduction

2

The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is:

  1. spermatocyte - spermatogonia - spermatid - sperms
  2. spermatogonia - spermatid - spermatocyte - sperms
  3. spermatid - spermatocyte - spermatogonia - sperms
  4. spermatogonia - spermatocyte - spermatid - sperms
AIPMT 2009
3

Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?

  1. Retention of well-developed corpus luteum
  2. Maintenance of high concentration of sex hormones in the blood stream
  3. Maintenance of the hypertrophical endometrial lining
  4. Fertilisation of the ovum
AIPMT 2009
4

A change in the amount of yolk and its distribution in the egg will affect:

  1. Fertilisation
  2. Pattern of cleavage
  3. Formation of zygote
  4. Number of blastomeres produced
AIPMT 2009
5

In humans, at the end of the first meiotic division, the male germ cells differentiate into the:

  1. secondary spermatocytes
  2. spermatogonia
  3. primary spermatocytes
  4. spermatids
AIPMT 2008
6

Which one of the following statements is incorrect about menstruation?

  1. The beginning of the cycle of menstruation is called menarche
  2. At menopause in the female, there is especially abrupt increase in gonadotropic hormones
  3. The menstrual fluid can easily clot
  4. During normal menstruation about 40 ml blood is lost
AIPMT 2008
7

Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?

  1. Yolk sac
  2. Amnion
  3. Chorion
  4. Allantois
AIPMT 2008
8

Which part of ovary in mammals acts as an endocrine gland after ovulation?

  1. Stroma
  2. Vitelline membrane
  3. Germinal epithelium
  4. Graafian follicle
AIPMT 2007
9

Sertoli cells are regulated by the pituitary hormone known as-

  1. LH
  2. FSH
  3. GH
  4. Prolactin
AIPMT 2006
10

Withdrawal of which of the following hormones is the immediate cause of menstruation?

  1. Progesterone
  2. FSH
  3. FSH-RH
  4. Estrogen
AIPMT 2006
11

Grey crescent is the area -

  1. Just opposite to the site of entry of sperm into ovum
  2. At the point of entry of sperm into ovum
  3. At the vegetal pole
  4. At the animal pole
AIPMT 2005

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