Question

The inner cell mass of blastocyst becomes
A)Differentiated into embryo proper
B)Extraembryonic membranes
C)Placenta
D)Chorionic villi

Answer 1

Hint: The blastocyst may be a structure formed within the early development of mammals. It possesses an inner cell mass (ICM) which subsequently forms the embryo. The outer layer of the blastocyst consists of cells collectively called the trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity referred to as the blastocoel. The trophoblast gives rise to the placenta.

Complete answer:
Blastocyst is a stage of the mammalian embryo . It is generally a form of blastula which develops from a berry-like cluster of cells. The blastocyst is composed of cells forming the outer trophectoderm, and an inner cell mass and a blastocoel.
In human blastocyst stage development occurs during the first and second week which follow the fertilization.
In the case of in vitro fertilization the blastocyst culture is important generally to increase the success rate of IVF in order to get a better embryo selection after better genomic activation and endometrial receptivity.

The physical and functional separation of the inner cell mass from the trophectoderm (TE) could be a special feature of mammalian development and is the first cell lineage specification in these embryos. Following fertilization within the oviduct, the mammalian embryo undergoes a comparatively slow round of cleavages to provide an eight cell morula. Each cell of the morula, called a blastomere, increases surface contact with its neighbors in an exceedingly process called compaction.The blastocyst consists of the outer cell layer called the trophoblast and therefore the inner cell mass. The inner cell mass will form all the tissues of the embryo and differentiate into embryo proper. The trophoblast will form the placental structures.

Hence, the correct answer is option (A)

Note: The zygote develops by mitosis, and when it's developed into 16 cells becomes called the morula. Until this stage in development, all cells (blastomeres) are autonomous and not specified to any fate. In many animals, the morula then develops by cavitation to become the blastula. Cellular differentiation then develops the blastula's cells into two types: trophoblast cells that surround the blastocoel and an inner mass of cells (the embryoblast). The conceptus is then referred to as the blastocyst.