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Biology 12 Chapter 21
Development and Aging - 5
1.
During gastrulation the sac bounded by amnion is called……….?
a) Embryonic disc
b) Amniotic sac
c) Germinal sac
d) Yolk sac
2.
Which of the following organism does NOT contain yolk in yolk sac during gastrulation?
a) Human
b) Fishes
c) Birds
d) Reptiles
3.
What does upper layer of embryonic disc call?
a) Meroblast
b) Holoblast
c) Epiblast
d) Hypoblast
4.
What does lower layer of embryonic disc call?
a) Meroblast
b) Epiblast
c) Holoblast
d) Hypoblast
5.
In which layer does epiblast NOT develop?
a) All of them
b) Mesoderm
c) Endoderm
d) Ectoderm
6.
In which layer does hypoblast develop?
a) Mesoderm
b) Endoderm
c) Ectoderm
d) All of them
7.
On which side epiblast faces?
a) Germinal sac
b) Embryonic disc
c) Amniotic sac
d) Yolk sac
8.
On which side hypoblast faces?
a) Amniotic sac
b) Embryonic disc
c) Yolk sac
d) Germinal sac
9.
What does appear in the centre of epiblast during gastrulation?
a) Blastodisc
b) Primitive streak
c) Epiblast
d) Embryonic disc
10.
Cells of primitive streak migrate through primitive streak ito interior of embryo to form…………….?
a) All of them
b) Endoderm
c) Mesoderm
d) Ectoderm
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