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  4. Identify the human development stage shown below as well as the related right place of its occurrence in a normal pregnant woman, and select the right option for the two, together.

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Q. Identify the human development stage shown below as well as the related right place of its occurrence in a normal pregnant woman, and select the right option for the two, together.Biology Question Image

VMMC MedicalVMMC Medical 2013

Solution:

After, fertilization, zygote undergoes rapid mitotic divisions, called cleavage, which is characterized by absence of growth of daughter cells. This leads to the conversion of single celled zygote into a multicellular structure called blastula. Implantation of zygote into endometrium of uterus occurs in blastocyst stage. The various stages in the journey of a fertilized egg from fertilization in the Fallopian tube to the implantation site in the uterus. Blastocyst comes in contact with the endometrium in the region of embryonal knob. It adheres to the same. The surface cells of trophoblast secrete lytic enzymes, which cause corrosion of endometrial lining. They also give rise to finger-like outgrowths called chorionic Villi, 4th later not only help in fixation but also absorption of nourishment.