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Human Reproduction · Question 107

AIPMT 2003MCQHard📈 Topic in 50% papers+4−1
1

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

Answer

(1) Organizer phenomena

Solution

The organizer is a specialised region of the early embryo (e.g. the dorsal lip of the blastopore, Spemann's organizer) that induces and directs the development of the surrounding undifferentiated tissue.

∴ The organizer sets up the main body axes of the embryo — anterior/posterior, dorsal/ventral and medial/lateral — and this establishment of polarity is called organizer phenomena.

Anamorphosis is development in which segments are added after hatching, so it is not related to axis polarity.

Answer: (1)

AIPMT 2003

Keep practising — Human Reproduction

2

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

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

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
4

Which set is similar?

  1. Corpus luteum – Graafian follicles
  2. Sebum – Sweat
  3. Bundle of His – Pacemaker
  4. Vitamin B7 – Niacin
AIPMT 2001
5

Which set is similar?

  1. Vitamin B7 – Niacin
  2. Sebum – Sweat
  3. Corpus luteum – Graafian follicles
  4. Bundle of His – Pacemaker
AIPMT 2001
6

Cleavage in mammals is

  1. holoblastic equal
  2. holoblastic unequal
  3. superficial
  4. discoidal.
AIPMT 2000
7

Blastopore is the pore of:

  1. A.C.
  2. Archenteron
  3. Blastocoel
  4. Coelom
AIPMT 2000

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