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Test: Embryonic Development


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Test: Embryonic Development - Question 1

Three germ layers are formed during which stage of Embryonic development.

Detailed Solution for Test: Embryonic Development - Question 1

Gastrulation: Formation of the three primary germ layers occurs during the first two weeks of development. The embryo at this stage is only a few millimeters in length. Gastrulation takes place after cleavage and the formation of the blastula and the primitive streak.

Test: Embryonic Development - Question 2

Movement of blastomeres usually seen in which Embryonic stage :-

Detailed Solution for Test: Embryonic Development - Question 2

Gastrulation is the process through which the germ layers arise during embryonic development. Morphogenetic motions such as invagination, ingression, and involution characterize this stage.
An epithelial lining of zygote cells pushes inward during the invagination process.
During ingression, epithelial lining cells move to produce mesenchymal cells.
During involution, embryonic tissue moves and folds inward, giving rise to an underlying layer.

Test: Embryonic Development - Question 3

The first movements of the foetus and appearance of hair on the head are usually observed during the :-

Detailed Solution for Test: Embryonic Development - Question 3

The first movements of the foetus and appearance of hair on the head are usually observed during the fifth month

Test: Embryonic Development - Question 4

In which stage rate of cell-division decreases?    

Detailed Solution for Test: Embryonic Development - Question 4

Gastrulation is a stage in most animals' embryonic development during which the single-layered blastula is rearranged into a trilaminar ("three-layered") structure known as the gastrula. The ectoderm, mesoderm, and endoderm are the three germ layers. As a result of the full rearrangement of cells that occurs during this phase, cell division decreases at this stage.

Test: Embryonic Development - Question 5

Fate map of embryo is prepared in which stage?

Detailed Solution for Test: Embryonic Development - Question 5

Fate mapping is a technique for understanding the embryonic origins of diverse tissues in the adult organism by establishing the correspondence between individual cells (or groups of cells) at one stage of development and their progeny at later stages of development. The map depicts an early-stage embryo, known as a blastula, with specific locations highlighted that are known to give rise to specific tissues in the adult organism.

Test: Embryonic Development - Question 6

Solid ball of cell produced by repeated cleavage is called

Detailed Solution for Test: Embryonic Development - Question 6

After fertilisation, the fertilised ovum is transformed to a zygote. The zygote goes through repeated mitotic divisions, known as cleavage. Cleavage occurs along distinct planes to form a solid mass of cells. Morula is the name given to this solid ball-like structure. Morula is changed into blastula, which has cells arranged in a corner and a cavity produced, which is known as a blastocoel.

Test: Embryonic Development - Question 7

Gastrulation is a process

Detailed Solution for Test: Embryonic Development - Question 7

In gastrulation differentiation of germ layer occur 

Test: Embryonic Development - Question 8

The first indication of division of labour in the blastomeres appear at

Detailed Solution for Test: Embryonic Development - Question 8

The gastrula stage is the initial step where cell differentiation occurs. Differentiated cells perform specific functions.
This is why not all cells are programmed to do the same thing. This condition exemplifies the nature of division of labour.
Morphological changes begin to emerge in the embryo, and each cell type begins to recognise one another.

Test: Embryonic Development - Question 9

Sexually reproducing multicellular animals start their development from -

Detailed Solution for Test: Embryonic Development - Question 9

Sexual reproduction involves the formation and fusing of gametes.
When gametes fuse, a unicellular zygote is formed.
This unicellular zygote is seen in all sexually reproducing species.
A zygote is a critical connection that ensures species continuity from one generation to the next.
Every sexually reproducing organism, including humans, begins life as a single cell–the zygote.

Test: Embryonic Development - Question 10

Correct sequence in development is -

Detailed Solution for Test: Embryonic Development - Question 10

Fertilization lead to zygote formation followed by Morula, blastocyst and Gastrula 

Test: Embryonic Development - Question 11

Preparation of cell differentiation are completed in-

Detailed Solution for Test: Embryonic Development - Question 11

Cleavage divides the zygote into many tiny cells that serve as the foundation for later development. At the completion of cleavage, the blastula's little cells begin to move around with relative ease, organising themselves into the patterns required for subsequent development. Surface proteins play a vital role in assisting cells to recognise one another and, as a result, in determining which cells adhere to create tissues. In the blastula stage, the preparation for cell differentiation is accomplished. Gastrulation is the process through which a blastula develops into a three-layered embryo, or gastrula.

Test: Embryonic Development - Question 12

What is true for cleavage :-

Detailed Solution for Test: Embryonic Development - Question 12

During cleavage, the zygote divides repeatedly, converting the large cytoplasmic mass into a large number of small blastomeres. Because cells are maintained within the zona pellucida, they divide but do not expand in size. Cell size, on the other hand, shrinks during cleavage.

Test: Embryonic Development - Question 13

Cleavage start in human in

Detailed Solution for Test: Embryonic Development - Question 13

Fertilization occur in fallopian tube in ampulla region at same location Cleavage start 

Test: Embryonic Development - Question 14

Type of cleavage in an egg is determined by :    

Detailed Solution for Test: Embryonic Development - Question 14

The pattern of embryonic cleavage is influenced by the position of the mitotic spindles as well as the amount and distribution of yolk.

Test: Embryonic Development - Question 15

Identical twins will be produced when :

Detailed Solution for Test: Embryonic Development - Question 15

One fertilised egg (ovum) divides and produces two offspring with identical genetic material. They are referred to as identical twins. In this situation, a fertilised egg divides into blastomeres, which then separate. The self-contained halves then grow into two newborns with identical genetic information.

Test: Embryonic Development - Question 16

Division of human egg is :

Detailed Solution for Test: Embryonic Development - Question 16

Because the blastomeres are evenly divided into two cells, the cleavage in the human egg is equal holoblastic.
Cleavage is not asymmetrical because the amount of yolk in the human egg is less since it is microlecithal, hence there is no resistance to cleavage.

Test: Embryonic Development - Question 17

The embryo with 8 to 16 blastomeres is called :

Detailed Solution for Test: Embryonic Development - Question 17

The zygote undergoes mitotic divisions known as cleavage. Blastomeres are the daughter cells generated during mitotic cleavage of the zygote. Morula is an embryo with 8-16 blastomeres that looks like a mulberry fruit.
Morula divides further to form a blastocyst, which moves towards the uterus.

Test: Embryonic Development - Question 18

Function of placenta is :-    

Detailed Solution for Test: Embryonic Development - Question 18

The placenta is a cushion-like structure that helps an embryo receive oxygen and nutrition while also removing carbon dioxide and excretory waste products produced by the embryo. It also functions as an endocrine tissue, producing hormones such human chorionic gonadotropin, human placental lactogen, estrogens, progesterone, and relaxin.

Test: Embryonic Development - Question 19

Stem cells are found in :-    

Detailed Solution for Test: Embryonic Development - Question 19

The blastocyst having inner cell mass has stem cells which are totipotent in nature and undergo division and differentiation.

Test: Embryonic Development - Question 20

The first sign of growing foetus may be noticed by :-

Detailed Solution for Test: Embryonic Development - Question 20

Growing humans develop their hearts at a very early stage, around the fifth week of gestation, and they begin working, therefore heartbeat detecting is very common and is seen as a growth sign.

Test: Embryonic Development - Question 21

During pregnancy only which hormones are secreted in women :-

Detailed Solution for Test: Embryonic Development - Question 21

Human placental lactogen, human chorionic gonadotropin and relaxin are produced only in pregnancy.

Test: Embryonic Development - Question 22

Placenta contains :-

Detailed Solution for Test: Embryonic Development - Question 22

The two main components of placenta are chorionic villi and uterine tissue.

Test: Embryonic Development - Question 23

During Implantation, the blastocyst becomes embedded in the which layer of the uterus.

Detailed Solution for Test: Embryonic Development - Question 23

Endometrium is part of the uterus which is a layer with blood vessels in which implantation occur

Test: Embryonic Development - Question 24

Name the embryonic stage that gets implanted in the uterine wall of a human female. 

Detailed Solution for Test: Embryonic Development - Question 24

Implantation is a process in which a developing embryo, moving as a blastocyst through a uterus, makes contact with the uterine wall and remains attached to it until birth. The lining of the uterus (endometrium) prepares for the developing blastocyst to attach to it via many internal changes.

Test: Embryonic Development - Question 25

Mammalian placenta originates from :

Detailed Solution for Test: Embryonic Development - Question 25

The placenta is developed from the embryo's chorion and allantois as well as the mother's endometrium. Its primary role is to allow chemicals to exchange between the foetus and the mother's body.

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