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Biology 12 Chapter 21
Development and Aging - 4
1.
The type of cleavage which occurs in the egg having animal and vegetal poles………….?
a) Holoblastic cleavage
b) Epiblastic cleavage
c) Hypoblastic cleavage
d) Meroblastic cleavage
2.
In which organisms does meroblastic cleavage occur?
a) Some fishes
b) Birds
c) Reptiles
d) All of them
3.
The egg undergoing meroblastic cleavage, cell divisions take place in………………….?
a) Blastodisc
b) Embryonic disc
c) Ectoderm
d) Primitive streak
4.
The small disc of cytoplasm at the animal pole is called……..?
a) Embryonic disc
b) Primitive streak
c) Ectoderm
d) Blastodisc
5.
Which is the second major phase of embryonic development?
a) Neurulation
b) Cleavage
c) Gastrulation
d) Organogenesis
6.
What is the characteristic of Gastrulation?
a) Differentiation of germ layers
b) Cleavage of blastodisc
c) Formation of blastocyst
d) Formation of morula
7.
What does the embryo having three layered stage called?
a) None of them
b) Blastula
c) Morula
d) Gastrula
8.
How many layers are present in gastrula?
a) 5
b) 3
c) 4
d) 2
9.
On which day gastrulation begins after fertilization/
a) 20th
b) 16th
c) 24th
d) 15th
10.
The double layer of cells separating fluid filled sacs during gastrulation is called………….?
a) Blastodisc
b) Epiblast
c) Primitive streak
d) Embryonic disc
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