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Biology 12 Chapter 21
Development and Aging - 10
1.
In the second experiment which germ layer was removed?
a) Endoderm
b) Mesoderm
c) Neural crest
d) Ectoderm
2.
In the second experiment due to removal of mesoderm there was no development of…………..?
a) Digestive system
b) Respiratory system
c) Nervous system
d) Reproductive system
3.
For which interaction of neighbouring cells is required?
a) Growth
b) All of them
c) Development
d) Differentiation
4.
What does grafted in experiments performed by Hans Spemann and Hilde Mangold?
a) Piece of dorsal lip of blastopore
b) Piece of dorsal lip of blastula
c) Piece of dorsal lip of blastocyst
d) Piece of dorsal lip of blastocoel
5.
In which stage reactive ability of host and grafted tissue of two embryos is greatest?
a) Blastula
b) Gastrula
c) Morula
d) Neurula
6.
Which is the primary organizer?
a) Ectoderm
b) Neural crest
c) Dorsal lip
d) Endoderm
7.
Which is induced by neural plate?
a) Neural groove
b) Neural tube
c) Primitive streak
d) Neural crest
8.
Neural crest is induced by…………….?
a) Primitive streak
b) Neural plate
c) Neural tube
d) Neural groove
9.
What is fertilization of an egg by sperm in Humans called?
a) Development
b) None of them
c) Conception
d) Blastulation
10.
Where does fertilization take place in Humans?
a) Vagina
b) Uterus
c) Proximal part of oviduct
d) Distal part of oviduct
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