C:-Primitive streak results from proliferation and movement of cells of epiblast to the median plane of embryonic disc
D:-Primitive streak disappears by the end of fourth week of embryonic life
Correct Answer:- Option-B

Question9:-Which of the following statement is/are correct about somites ?

i. Somites give rise to the adjacent epidermis of skin

. Formation of somites involves the expression of Hox genes

iii. By the end of fifth week, 42 to 44 pairs of somites are present

iv. Craniocaudal segmental pattern of the somites is regulated by the Delta-Notch signaling system

B:-All of the above (i, ii, iii and iv)
C:-Only (ii and iii)
D:-Only (i, ii and iii)

Correct Answer:- Option-A
Question10:-Which of the following 15 not a neural crest derivative 7
A:-Melanocytes in skin
-Cells of anterior pituitary
C:-Odontoblasts
D:-Satellite cells
Correct Answer:- Option-B
Question11:-Select the incorrect statement regarding twinning
A:-Approximately two thirds of twins are dizygotic
B:-Incidence of monozygotic twinning is approximately the same in all populations
C:-Dizygotic twins always have two amnions and two chorions
D:-Twin transfusion syndrome occurs in as many as 50% of monochorionic-diamniotic monozygous twins
Correct Answer:- Option-D
Question12:-Which of the following statements is not true about allantois ?
A:-Allantois appears as a diverticulum from the caudal wall of the umbilical vesicle
-It's blood vessels persist as the umbilical vein and arteries
C:-Extraembryonic part of the allantois degenerates during the fourth month
D:-Blood formation occurs in the wall of allantois during the third to fifth weeks of embryonic life
Correct Answer:- Option-C
Question13:-The protein hormones synthesised by the placenta are all except
A:-hCG
B:-Progesterone
C:-Human chorionic thyrotropin
D:-Human placental lactogen
Correct Answer:- Option-B
Question14:-Which of the following paranmeters in triple test indicate the probability of Down syndrome ?
A:-Increase in alphafetoprotein
B:-Increase in unconjugated estriol
C:-Increase in human chorionic gonadotropin
D:-Increase in inhibin A
Correct Answer:- Option-C
Question15:-Which of the following diseases is transmitted by autosomal recessive mode ?
A:-Phenylketonuria
B:-Red green color blindness
C:-G6PD deficiency
D:-Neurofibromatosis
Correct Answer:- Option-A
Question16:-All of the following statements regarding median cubital vein are true except
A:-It passes upwards and medially from cephalic to basilic vein
B:-It lies in front of bicipital aponeurosis
C:-It usually lies between lateral and medial cutaneous nerves of forearm
D:-It usually does not communicate with deep veins of the forearm
Correct Answer:- Option-D
Question17:-Palmaris brevis is supplied by
A:-Superficial terminal branch of ulnar nerve
B:-Palmar cutaneous branch of ulnar nerve
C:-Deep terminal branch of ulnar nerve
D:-Recurrent branch of median nerve