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Human Reproduction · Question 94

AIPMT 2009MCQMedium📈 Topic in 50% papers+4−1
1

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

Answer

(2) Maintenance of high concentration of sex hormones in the blood stream

Solution

As per NCERT, menstruation occurs only when the ovum is not fertilised: the corpus luteum degenerates, the level of progesterone falls and the endometrium disintegrates.

⇒ The endometrium is maintained only as long as the blood levels of the ovarian sex hormones (progesterone and oestrogen) remain high.

∴ The immediate (root) cause that prevents menstruation is the maintenance of a high concentration of sex hormones in the blood stream; a retained corpus luteum and a thick endometrium are only the source and the effect of these hormones.

Answer: (2)

AIPMT 2009

Keep practising — Human Reproduction

2

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
3

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
4

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
5

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

  1. Yolk sac
  2. Amnion
  3. Chorion
  4. Allantois
AIPMT 2008
6

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
7

Sertoli cells are regulated by the pituitary hormone known as-

  1. LH
  2. FSH
  3. GH
  4. Prolactin
AIPMT 2006
8

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

  1. Progesterone
  2. FSH
  3. FSH-RH
  4. Estrogen
AIPMT 2006
9

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
10

If mammalian ovum fails to get fertilized, which one of the following is unlikely?

  1. Corpus luteum will disintegrate
  2. Estrogen secretion further decreases
  3. Primary follicle starts developing
  4. Progesterone secretion rapidly declines
AIPMT 2005
11

Ovulation in the human female normally takes place during the menstrual cycle

  1. At the beginning of the proliferative phase
  2. At the mid secretory phase
  3. Just before the end of the secretory cycle
  4. At the end of the proliferative phase
AIPMT 2004

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