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Embryonic Development Mcq
Quiz 4
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Q.1
Active inrolling of endodermal and mesodermal cells into interior of embryo is ... [ JIPMER 1997 ]
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a) ingression
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b) involution
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c) inversion
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d) epiboly
Explanation
Involution: Rolling in of blstomeres into the interior of embryo. Answer : (b)
Q.2
Notochord, skeletal system and dermis of skin are derived from ... ... kcet 2008 ]
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a) Mesoderm
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b) Endoderm
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c) Ectoderm
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d) All the above
Explanation
Notochord, Skeletal sysytem are derived from mesoderm. Dermis of skin is middle layer of skin. It also originates from mesoderm. Answer : (a)
Q.3
total cleavage is possible in egg ... ... [ MPPMT 1994 ]
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a) isolecithal
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b) mesolecithal
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c) oligolecithal
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d) telolecithal
Explanation
The holoblastic type of cleavage (total cleavage) is commonly seen in eggs containing moderate to sparse amount of yolk. Oligolecithal eggs are those eggs in which very small amount of evenly distributed yolk is present, e.g., in many invertebrates. Thus, holoblastic is seen in oligolecithal. Answer : (c)
Q.4
Fixing up of blastocyst in the wall of uterus is ... ... [ MPPMT 2002 ]
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a) Impregnation
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b) Placentation
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c) Implantation
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d) Fertilisation
Explanation
Implantation: It is anchoring or embedding of the blastocyst into endometrium of uterus. Implantation begins about seventh days of fertilization of ovum. It takes about three days for the process to be completed. Answer : (c)
Q.5
Mosaic cleavage occurs in ... ... [ RPMT 2000 ]
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a) Camel
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b) Dog Fish
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c) Whale
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d) Echinococcus
Explanation
Determinate cleavage (also called mosaic cleavage) is in most protostomes. It results in the developmental fate of the cells being set early in the embryo development. Each blastomere produced by early embryonic cleavage does not have the capacity to develop into a complete embryo. Answer : (d)
Q.6
Which one develops from ectoderm? [ Odisha 2010 ]
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a) Liver and heart
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b) Notochord and vertebral column
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c) Spinal cord and brain
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d) Eye and skin
Explanation
Liver is originated from endoderm. Heart, notochord and vertebral column are derived from mesoderm. Brain and spinal cord are originated from ectoderm. Eyes and skin derives from ectoderm and mesoderm. Answer : (c)
Q.7
During development which of the following organs is formed first ... ... [ RPMT 2005 ]
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a) Heart
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b) Brain
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c) Neural tube
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d) Skin
Explanation
The neural folds migrate toward the midline of the embryo, eventually fusing to form the neural tube beneath the overlying ectoderm. It starts during the 3rd week of gestation. Heart starting forming at 4th week of gestation. Answer : (c)
Q.8
Mesoderm is formed through invagination of ... .. [ Guj CET 2006 ]
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a) Ectoderm
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b) Endoderm
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c) Inner mass of cells
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d) Primitive streak
Explanation
Gastrulation involves the rearrangement and migration of cells from the epiblast. A primitive streak which is a faint groove on the dorsal surface of the epiblast is formed. Once the cells are invaginated, some of them displcae the hypoblast forming endoderm. Other cells remain between the epiblast and newly formed endoderm forms the mesoderm. Cells of the remaining in the epiblast form ectoderm. Answer : (d)
Q.9
When do the three germinal layers differentiate ... .... [ RPMT 1996 ]
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a) Blastula
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b) Gastrula
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c) Cleavage
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d) Fertilization
Explanation
Transformation of the blastocyst into grastula with primary germ layers by rearrangemnt of the cells is called gastrulation. Answer : (b)
Q.10
Primary germ layers are ... ....
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a) trophoblast, ectoderm, mesoderm and endoderm
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b) endoderm, trophectoderm and tropho-mesoderm
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c) tropho-mesoderm and trophectoderm
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d) ectoderm, mesoderm and endoderm
Explanation
Answer : (d)
Q.11
In mammals, primitive streak gives rise to ... ... [ MPPMT 1994 ]
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a) Ectoderm
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b) Mesoderm
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c) Endoderm
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d) All the germs layers
Explanation
Answer : (b)
Q.12
In higher animal blastopore generally forms ... ... [ JIPMER 2002]
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a) Anus
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b) Mouth
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c) Liver
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d) Gut
Explanation
Answer : (a)
Q.13
Macrolecithal eggs are characterised by ... ... [ Manipal 2005 ]
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a) Little yolk
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b) Abundant yolk
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c) Entry of sperm
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d) Pattern of cleavage
Explanation
Answer : (b)
Q.14
Structure absent in Frog's testis is ... ... [ BHU 2003 ]
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a) Seminiferous tubules
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b) Seminal vesicles
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c) Sertoli cells
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d) Interstitial cells
Explanation
Answer : (c)
Q.15
Testis of Whale are ... ... [ RPMT 1996 ]
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a) Extra-abdominal
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b) Half external, half internal
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c) Internal
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d) None of the above
Explanation
Answer : (c)
Q.16
Gonads/ testes develop from embryonic ... ... [ CBSE 1990 ]
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a) Ectoderm
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b) Endoderm
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c) Mesoderm
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d) Both mesoderm and endoderm
Explanation
Answer : (c)
Q.17
Study of formation of sensory organs is ... ... [ CMC 2002 ]
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a) Organogenesis
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b) Neurogenesis
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c) Mesogenesis
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d) Notogenesis
Explanation
Answer : (a)
Q.18
In human female the blastocyst ... .. [ CBSE 2010 ]
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a) Gets implanted in endometrium by trophoblast cells
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b) Forms placenta even before implantation
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c) Gets implanted into uterus 3 days after ovulation
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d) Gets nutrition from uterine endometrial secretion only after implantation
Explanation
Answer : (a)
Q.19
Which is urinary bladder of child in womb? ... ... [ MPPMT 1995 ]
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a) Urinary bladder
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b) Liver
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c) Allantois
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d) Amnion
Explanation
Answer : (c)
Q.20
In the urogenital system one of the following part is present in males and not in females ... ... [ CPMT 2005 ]
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a) Urethra
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b) Fallopian tube
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c) Vagina
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d) Vas deferens
Explanation
Answer : (d)
Q.21
Migration and rearrangement of cells during embryo development occur in ... ... [ MPPMT 1994 ]
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a) Epiboly
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b) Emboly
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c) Involution
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d) Gastrulation
Explanation
Answer : (d)
Q.22
In apomictic/ parthenogenetic development the individuals are .... ... [ CPMT 1997]
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a) Morphologically and genetically similar
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b) Morphologically and genetically different
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c) Morphologically different but genetically similar
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d) None of the above
Explanation
Answer : (a)
Q.23
Cleavage involving incomplete division is ... ... [ MPPMT 1996 ]
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a) Spiral
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b) Meroblastic
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c) Holoblastic
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d) Meridional
Explanation
Answer : (b)
Q.24
Assertion: From evolutionary point of view, human gestation period is shortening Reason: A major trend in humans has been larger head undergoing faster growth in foetal stages ... .... [ AIIMS 2004 ]
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (c)
Q.25
ganglia of sympathetic and other neural systems develop from ... ... [ AIIMS 2002 ]
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a) Neural cell
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b) Neural plate cells
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c) Notochord cells
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d) Neural crest cells
Explanation
Answer : (d)
Q.26
Which one develops from ectoderm ... .. [ RPMT 1996 ]
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a) Adrenal medulla
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b) Adrenal cortex
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c) Blood
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d) lymph
Explanation
Answer : (a)
Q.27
During gastrulation blastomere moves from the surface to their destination in the embryo. These movements are called ... ...
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a) migratory movements
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b) formative movements
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c) morphogenetic movements
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d) All the above
Explanation
Answer : (d)
Q.28
Holoblastic cleavage occurs in ... ... [ JIPMER 1997 ]
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a) Insects
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b) Frog
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c) Birds
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d) Mammals
Explanation
Answer : (d)
Q.29
Eggs produced in a year by an ovary of non pregnant woman is ..... ....
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a) 12
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b) 6
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c) 24
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d) 48
Explanation
Answer : (b)
Q.30
Which is correct about morula ... .. [ CBSE 2010 ]
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a) Less cytoplasm and less DNA than zygote
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b) Same amount of cytoplasm and DNA as zygote
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c) More cytoplasm and more DNA than zygote
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d) Same amount of cytoplasm much more DNA than zygote
Explanation
Answer : (d)
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