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Embryonic Development Mcq
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Q.1
Metadiscoidal placenta is found in ... ... [ CET Chd 2010 ]
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a) Humans
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b) Cow
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c) Pig
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d) Rabbit
Explanation
Answer : (a)
Q.2
Which one is initiated by secretion of trophoblast?
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a) Blastulation
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b) Implantation
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c) Cleavage
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d) Gastrulation
Explanation
Answer : (b)
Q.3
Development of animal embryo from an unfertilized egg is called ... ... [ Bih PMT 2004 ]
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a) Parthenocarpy
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b) parthenogenesis.
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c) apospory
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d) apomixis
Explanation
Answer : (b)
Q.4
Morphogenetic movement involve ... ...
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a) Movement of organs
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b) Movement of small cell masses
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c) Movement of large cells masses
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d) Differentiation of cells
Explanation
The movement of cells in the early embryo that change the shape or form of differentiating cells and tissues. Answer : (b)
Q.5
The amnion of mammalian embryo is derived from ... ..[NEET 2018]
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a) mesoderm and trophoblast
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b) endoderm and mesoderm
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c) ectoderm and mesoderm
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d) ectoderm and endoderm
Explanation
Amnion of mammalian embryo is derived from ectoderm and mesoderm. It is one of the extraembryonic membranes which is formed by the amniogenic cells of ectodermal origin on the inner side and somatopleuric extraembryonic mesoderm on outer side. Answer : (c)
Q.6
Haemoendothelial placenta occurs in ... ... [ BHU 2001 ]
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a) Man and Ape
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b) Cow and Goat
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c) Deer and Camel
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d) Rat and Rabbit
Explanation
Haemoendothelial Placenta: In this type of placenta the chorionic villi looses their epithelium and mesenchymal layers to such a degree that the endothelial wall of the foetal blood vessels remain in contact with the maternal blood. The haemoendothelial placenta is observed in mouse, rat, rabbit, guinea-pig etc. Answer : (d)
Q.7
Which one is not associated with gametogenesis ... ... [ Manipal 2002 ]
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a) Formation of ova
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b) Formation of spermatids
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c) Release of ova
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d) Change of spermatid to spermatozoa
Explanation
Gametogenesis, in embryology, the process by which gametes, or germ cells, are produced in an organism. We call gametogenesis in the male spermatogenesis and it produces spermatozoa. In the female, we call it oogenesis. It results in the formation of ova. Answer : (c)
Q.8
A zygote is completely divided into two by a cleavage furrow. the cleavage type is ... ... [ MPPMT 1992 ]
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a) Equatorial
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b) Meroblastic
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c) Radial
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d) Holoblastic
Explanation
Heroblastic cleavage: Cleavage furrows extend completely through the entire length of the egg and biesct into equal or almost equal sized blastomeres. Example: Amphioxus, marsupials and placental mammals. Answer : (d)
Q.9
Adrenal medulla and membranous labyrinth develop from ... ... [ RPMT 1998 ]
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a) Ectoderm
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b) Endoderm
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c) Mesoderm
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d) Both B and C
Explanation
The membranous labyrinth or endolymphatic labyrinth is the part of the inner ear housed in the osseous labyrinth. It develops from ectoderm. The inner part of the adrenal gland (a small organ on top of each kidney). It also develops from ectoderm. Answer : (a)
Q.10
Reptile and bird eggs are ... ... [ AIIMS 1996 ]
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a) Macrolecithal
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b) Oligolecithal
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c) Mesolecithal
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d) Alecithal
Explanation
Macrolecithal or megalecithal are the eggs of egg laying animals. The eggs contain a very large amount of yolk, e.g., reptiles and birds. Oligolecithal eggs are those eggs in which very small amount of evenly distributed yolk is present, e.g., in many invertebrates. Mesolecithal eggs have comparatively more yolk than the microlecithal eggs. The distribution of yolk is distinctly unequal. The eggs of sharks, ganoid fishes, dipnoi and many amphibians are of this type. Alecithal Egg: When the egg contains no yolk, it is called alecithal egg. Eg. The eggs of eutherian mammals. Answer : (a)
Q.11
Nebenkern is part of ... ... [ KCET 2004 ]
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a) Human ovum
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b) Human sperm
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c) Foetus
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d) Graafian follicle
Explanation
Middle piece of a sperm is a long cylindrical part which lies between the neck and the tail. Axoneme or axial filament of microtubules runs through it. The same is covered by mitochondrial spiral (Nebenkern) of 10-14 turns. Mitochondrial activity helps in providing energy. Answer : (b)
Q.12
Which one contains only mesodermal structure? [ MPPMT 1992 ]
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a) Liver, heart, blood and muscles
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b) Notochord, heart, blood and bone
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c) Liver, heart, blood and bone
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d) Liver, blood, notochord and muscles
Explanation
Notochord, heart, blood, muscles and bone are derived from mesoderm. Liver is derived from endoderm. Answer : (b)
Q.13
Amount of yolk and its distribution are changed in the egg. Which one is affected ... .. [ CBSE 1993]
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a) pattern of cleavage
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b) formation of zygote
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c) number of blastomeres
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d) fertilization
Explanation
any considerable amount of yolk will retard the division, or prevent the complete division, of the fertilized ovum. The amount and distribution of the yolk will therefore determine the type of segmentation. The cleavage can be holoblastic (total or entire cleavage) or meroblastic (partial cleavage). Answer : (a)
Q.14
Function of prostate gland is .... ...(Wardha 2005 ]
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a) Storage of semen
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b) Provide motility to sperms
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c) Formation of semen
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d) Release of hormones
Explanation
The prostate's primary function is to produce the fluid that nourishes and transports sperm (seminal fluid). Answer : (b)
Q.15
Meroblastic cleavage occurs in egg ... ... [ RPMT 1998 ]
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a) Isolecithal
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b) Microlecithal
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c) Telolecithal
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d) All the above
Explanation
Meroblastic cleavage is called as partial or incomplete cleavage is shown in telolecithal eggs in which yolk is concentrated to one end of the egg. Answer : (c)
Q.16
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
Ganglia, sensory cells and neural system is derived from neural crest. Answer : (d)
Q.17
Ball-like structure formed after completion of cleavage is ... ... [ manipal 2003 ]
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a) Blastula
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b) Morula
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c) Gastrula
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d) Neural plate
Explanation
After the fertilization, the zygote is formed. It undergoes rapid mitotic divisions and the process is known as cleavage. During cleavage the zygote divide from one cell to two cell to four and so on. After the cleavage is completed an 8-16 cell structure is formed that is known as the morula. Morula is a ball like structure that later develops into blastula and so on. Answer : (b)
Q.18
Morphogenetic movements take place during ... ... [ MHTCET 2010 ]
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a) formation of morula
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b) blastulation
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c) gastrulation
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d) organogenesis
Explanation
During gastrulation, the blastomeres move from one place to. another. These cell movements transform the blastula into gastrula. As these movements lead to the formation of a new shape to the. embryo, these movements are called morphogenetic movements. Answer : (c)
Q.19
Morphogenetic movements convert hollow spherical blastula into ... ... [ kerala 2001 ]
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a) Gastrula
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b) Morula
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c) Neurula
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d) Embryonic disc
Explanation
During gastrulation, the blastomeres move from one place to. another. These cell movements transform the blastula into gastrula. As these movements lead to the formation of a new shape to the. embryo, these movements are called morphogenetic movements. Answer : (a)
Q.20
Egg of Frog is ... ... [ BHU 1996 ]
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a) Centrolecithal
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b) Macrolecithal
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c) Telolecithal
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d) Microlecithal
Explanation
The egg of the frog is mesolecithal as moderate amount of yolk is present. As the yolk is concentrated in the lower part of the egg and the cytoplasm in the upper part, these eggs are moderately telolecithal. Answer : (c)
Q.21
Eye lens is formed from ... ... [ CBSE 1992 ]
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a) Ectoderm
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b) Mesoderm
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c) Endoderm
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d) Ectoderm and mesoderm
Explanation
The eye lens is derived from the ectoderm. Answer : (a)
Q.22
Site of vitellogenesis is ... ... [ Manipal 2002 ]
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a) Secondary oocyte in fallopian tube
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b) Primary oocyte in Graafian follicle
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c) Primary spermatocyte in testis
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d) Secondary spermatocyte in testis
Explanation
Vitellogenesis (also known as yolk deposition) is the process of yolk formation via nutrients being deposited in the oocyte, or female germ cell involved in reproduction of lecithotrophic organisms. It takes place in the primary oocyte of the Graafian follicle. This process is regulated by the Vit gene and the major protein is vitellogenin. Answer : (b)
Q.23
Termination of gastrulation is indicated by ... ... [ CBSE 1993 ]
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a) Obliteration of blastocoel
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b) Obliteration of archenteron
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c) Closure of blastopore
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d) Closure of neural tube
Explanation
The blastocoel progressively shrinks and eventually disappears, which marks the end of gastrulation. Answer : (a)
Q.24
Mammalian blastula is known as .. ... [ MPPMT 2010 ]
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a) Trophoderm
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b) Blastocyst
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c) Foetal blastula
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d) Oedema
Explanation
In mammals, the blastula is referred to as a blastocyst. The blastocyst contains an embryoblast (or inner cell mass) that will eventually give rise to the definitive structures of the fetus, and a trophoblast which goes on to form the extra-embryonic tissues. Answer : (b)
Q.25
The most primitive type of mammalian placenta is ... ... [ RPMT 1998 ]
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a) Syndesmochorial
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b) Endotheliochorial
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c) haemochorial
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d) Epitheliochorial
Explanation
A placenta in which the chorion is next to the lining of the uterus but does not invade or erode the lining. Epitheliocohorial type of mammalian placenta is observed in cattle, pigs etc. Answer : (d)
Q.26
Which one occurs first in embryo ... ... [ JIPMER 2003 ]
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a) Neurogenesis
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b) Notogenesis
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c) Hepatogenesis
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d) Cardiogenesis
Explanation
Notogenesis is the development of the notochord by epiblasts that form the floor of the amnion cavity. The notochord is a flexible rod and primitive beginning to the backbone. It's development start from third week of gestation period. Answer : (b)
Q.27
In telolecithal egg the yolk is found ... ... [ CBSE 1993 ]
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a) All over the egg
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b) On one side
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c) Both the sides
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d) Centre
Explanation
Eggs with abundant yolk concentrated in one hemisphere of the egg are termed telolecithal. This occurs in many invertebrates and in all vertebrates lower than marsupial mammals. Answer : (b)
Q.28
gastrula end stage is characterised by ... .. [ CBSE 1992 ]
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c) Formation of neural tube
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a) End of Blastocoel
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b) Blastopore
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d) End of archenteron
Explanation
The blastocoel progressively shrinks and eventually disappears, which marks the end of gastrulation. Answer : (a)
Q.29
Meroblastic segmentation occurs during the development of ... ... [ MPPMT 1992 ]
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a) Pigeon
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b) Human
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c) Frog
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d) Dog Fish
Explanation
Meroblastic cleavage is the type of cleavage in which the cell divides partially. Meroblastic cleavage takes place in those eggs where the amount of yolk is high, which leads to the partial or incomplete cleavage. It can be discoidal or superficial. It is usually found in monotremes, birds including pigeons, reptiles and certain fishes and arthropods. Answer : (a)
Q.30
Choose the correct one ... ...[Manipur 2007]
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a) Mesoderm - skeleton
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b) Mesoderm - brain
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c) Ectoderm - liver
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d) Endoderm - epidermis
Explanation
Epidermis of skin and brain is derived from ectoderm. Liver is derived from endoderm. Skeleton is derived from mesoderm. Answer : (a)
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