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Human Reproduction · Question 102

AIPMT 2005MCQMedium📈 Topic in 25% papers+4−1
1

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

Answer

(1) Just opposite to the site of entry of sperm into ovum

Solution

In the amphibian (frog) egg, the sperm enters in the pigmented animal hemisphere.

⇒ After fertilisation, the outer cortical cytoplasm rotates towards the point of sperm entry.

⇒ On the side diametrically opposite to the sperm entry point, a grey, crescent-shaped area appears between the dark animal and pale vegetal hemispheres.

∴ The grey crescent lies just opposite to the site of entry of sperm into the ovum (it marks the future dorsal side of the embryo).

Answer: (1)

AIPMT 2005

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2

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
3

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
4

Which of the following hormones is not a secretion product of human placenta?

  1. Estrogen
  2. Progesterone
  3. Prolactin
  4. Human chorionic gonadotropin
AIPMT 2004
5

Bartholin's glands are situated

  1. on the sides of the head of some amphibians
  2. at the reduced tail end of birds
  3. on either side of vagina in humans
  4. on either side of vas deferens in humans.
AIPMT 2003
6

During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called:

  1. Organizer phenomena
  2. Pattern formation
  3. Axis formation
  4. Anamorphosis
AIPMT 2003
7

Mainly which type of hormones control the menstrual cycle in human beings?

  1. FSH
  2. LH
  3. FSH, LH, estrogen
  4. progesterone
AIPMT 2002
8

What is true for cleavage?

  1. Size of embryo decreases
  2. Size of embryo increases
  3. Size of cells increases
  4. Size of cells decreases
AIPMT 2002
9

Which set is similar?

  1. Corpus luteum – Graafian follicles
  2. Sebum – Sweat
  3. Bundle of His – Pacemaker
  4. Vitamin B7 – Niacin
AIPMT 2001
10

Which set is similar?

  1. Vitamin B7 – Niacin
  2. Sebum – Sweat
  3. Corpus luteum – Graafian follicles
  4. Bundle of His – Pacemaker
AIPMT 2001
11

Cleavage in mammals is

  1. holoblastic equal
  2. holoblastic unequal
  3. superficial
  4. discoidal.
AIPMT 2000

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