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Human Reproduction · Question 87

AIPMT 2010 (Prelims)MCQMedium📈 Topic in 25% papers+4−1
1

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

Answer

(1) It has almost equal quantity of cytoplasm as an uncleaved zygote but much more DNA

Solution

As per NCERT, the zygote undergoes mitotic divisions (cleavage) as it moves through the isthmus towards the uterus, forming 2, 4, 8, 16 daughter cells called blastomeres; the embryo with 8 to 16 blastomeres is called a morula.

∵ During cleavage there is no growth phase, the zygote is only divided into smaller and smaller blastomeres ⇒ the total cytoplasm stays almost the same as in the zygote.

∵ Every blastomere receives a full diploid set of DNA (DNA replicates before each division) ⇒ the total DNA of a 16-celled morula is much more than that of the zygote.

Answer: (1)

AIPMT 2010 (Prelims)

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2

The part of Fallopian tube closest to the ovary is

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

Seminal plasma in humans is rich in :

  1. Fructose, calcium and certain enzymes
  2. Fructose and certain enzymes but poor calcium
  3. Glucose and certain enzymes but has no calcium
  4. Fructose and calcium but has no enzyme
AIPMT 2009
4

Which one of the following is the correct matching of the events occurring during menstrual cycle?

  1. Ovulation: LH and FSH attain peak level and sharp fall in the secretion of progesterone
  2. Menstruation: Breakdown of myometrium and ovum not fertilised
  3. Secretory phase: Development of corpus luteum and increased secretion of progesterone
  4. Proliferative phase: Rapid regeneration of myometrium and maturation of Graafian follicle
AIPMT 2009
5

Given below is a diagrammatic sketch for a portion of human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D. [Figure]

  1. A - Ureter, B - Seminal vesicle, C - Prostate, D - Bulbourethral gland
  2. A - Vas deferens, B - Seminal vesicle, C - Prostate, D - Bulbourethral gland
  3. A - Vas deferens, B - Seminal vesicle, C - Bulbourethral gland, D - Prostate
  4. A - Ureter, B - Prostate, C - Seminal vesicle, D - Bulbourethral gland
AIPMT 2009
6

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
AIPMT 2009
7

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
8

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
9

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
10

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
11

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

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