Biology
Embryonic Development
572 Questions
Embryonic development questions cover the biological processes of gamete fusion, germ layer formation, and fetal maturation. The focus lies in identifying extraembryonic structures, trophoblast functions, and sequential developmental stages. This specialized topic appears regularly in biology screening tests and medical entrance examinations.
Germ layer formationBlastocyst implantationExtraembryonic structuresFetal development stagesReproductive physiology
Embryonic Development Questions
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amnion
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yolk sac
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chorion
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all of these
C
Correct answer
Explanation
Placenta in mammalian embryo is formed by chorion.
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Ectoderm
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Endoderm
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Mesoderm
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Periderm
B
Correct answer
Explanation
Thyroid gland develops from the endoderm of the embryo.
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Only a
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Only a and b
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Only b
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Only b and c
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Only c
B
Correct answer
Explanation
This is the correct option. Embryo and foetus are multicellular.
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Only a
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Only a and b
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Only b
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Only b and c
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Only c
E
Correct answer
Explanation
This is the correct option as this statement is false.
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Heart
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Lungs
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Primitive gut
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Brain
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NA
C
Correct answer
Explanation
Gastrulation involves a process of invagination at one end of blastula which results in the formation of two-layered cup-shaped gastrula.
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mesoderm
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endoderm
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ectoderm
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All of the above
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NA
B
Correct answer
Explanation
It is the correct answer. Liver and pancreas develop from endoderm.
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Graveyard of RBC
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Lymphoid gland
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Largest lymph gland
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Endodermal in origin
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Made up of reticular connective tissue
D
Correct answer
Explanation
Spleen is mesodermal in origin.
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protoderm
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ectoderm
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endoderm
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mesoderm
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pyoderma
B
Correct answer
Explanation
Ectoderm is the outermost of the three primary germ layers of an embryo, from which the epidermis, nervous tissue and sense organs develops. The human mammary gland is derived from ectoderm.
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Umbilical cord
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Inner cell mass of the blastocyst
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Decidua
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Myoblast cells
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Trophectoderm
E
Correct answer
Explanation
The developing embryo has two main populations of cells: an inner cell mass and a trophectoderm. The trophectoderm cells lie at the outer surface of the developing embryo and will become the placenta.
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Leydig and thecal cells
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Spermatogonia and oogonia
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Sertoli cells
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Sex cords
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Granulosa cells
A
Correct answer
Explanation
Mesenchyme arising beneath the germinal epithelium in the testes is the precursor to testicular interstitial cells, or Leydig cells, while in the ovaries it is the precursor to ovarian stroma or thecal cells.
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Ectoderm
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Mesoderm
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Endoderm
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All of the above
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NA
A
Correct answer
Explanation
It is the correct option, it forms the outer layer of skin and nervous system.
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morula
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blastocoel
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archenteron
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blastocyst
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oesophagus
C
Correct answer
Explanation
It is the primitive gut that forms during gastrulation in the developing embryo.
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egg and polar nuclei
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egg
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synergids
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antipodal cells
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synergids and antipodal cells
C
Correct answer
Explanation
Synergids direct the growth of pollen tube by secreting some chemical substances.
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alectithal
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mesolecithal
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microlecithal
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macrolecithal
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None of these
C
Correct answer
Explanation
It is an egg that has little yolk.
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blastulation
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organogenesis
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fertilisation
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gametogenesis
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spermatogenesis
B
Correct answer
Explanation
It is the process of differentiation of cells at specific places in the germ layer to form tissue, organ and organ system.