This set of Human Anatomy Question Bank focuses on “Embryology – Form of Embryo at Different Stages its Growth”.
1. The zygote undergoes cleavage forming a solid ball of cells of the uniform size called _________
a) Morula
b) Blastula
c) Gastrula
d) Neurula
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Explanation: Morula is an early stage embryo consisting of cells in solid balls contained within zona pellucida.
2. The third layer to form in gastrulation is ____________
a) Archenteron
b) Ectoderm
c) Endoderm
d) Mesoderm
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Explanation: Mesoderm is one of the three primary germ layers in the early embryo. It is formed during gastrulation.
3. Development of all organs can be traced in single germ layer.
a) True
b) False
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Explanation: Development of all organs can be traced in single germ layer.
4. The trophoblast gives rise to ___________
a) Chorion
b) Neurula
c) Allantois
d) Placenta
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Explanation: Trophoblast are cells forming the outer layer of blastocyst which provide nutrients to the embryo and develop into large part of placenta.
5. Gastrulation occurs during the 2nd week of embryonic development.
a) True
b) False
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Explanation: Transformation of blastula into gastrula is gastrulation. It occurs during 2nd week of development.
6. Cleavage begins at ____________
a) Vagina
b) Ovary
c) Uterus
d) Oviduct
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Explanation: Cleavage begins at oviduct. In humans cleavage begins while fertilized egg is still passing down the oviduct.
7. The cavity inside the blastula is called as _____________
a) Blastocoel
b) Blastomere
c) Gastrula
d) Animal pore
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Explanation: The cavity inside the blastula is called as Blastocoel. It is a fluid filled cavity.
8. The vertebrate embryo develops into hollow ball called as _______________
a) Fistula
b) Blastula
c) Gastrula
d) Morula
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Explanation: Blastula is a hollow sphere of cells surrounding an inner fluid filled cavity. The cells of blastula is referred as blastomere.
9. The embryo at 16 celled stage is known as ___________
a) Morula
b) Gastrula
c) Blastula
d) Blastomere
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Explanation: Morula is the solid ball of cells resulting from the division of a fertilized ovum from which a blastula is formed.
10. Blastopore is the opening of _____________
a) Blastomere
b) Blastula
c) Gastrula
d) Archenteron
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Explanation: Blastopore is the opening of Archenteron. The opening of archenteron in the gastrula that develops into the mouth in protostomes and anus in deuterostomas.
11. At the time of implantation the embryo is called as ________
a) Blastocyst
b) Zygote
c) Fetus
d) Morula
View Answer
Explanation: Blastocyst is the structure formed in early development of mammals. It possesses an inner cell mass which subsequently forms the embryo. Outer layer consists of cells collectively called trophoblast.
Sanfoundry Global Education & Learning Series – Human Anatomy and Physiology.
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