The Embryonic Period Trivia Quiz With MCQ Questions

Explanation
During the second week of pregnancy, the developing embryo forms two layers. These layers are known as the embryonic disc and they eventually give rise to all the major organs and tissues of the body. The upper layer is called the ectoderm and it develops into the nervous system, skin, and hair. The lower layer is called the endoderm and it gives rise to the digestive system, lungs, and other internal organs. These two layers are the initial building blocks of the developing embryo at this stage of pregnancy.

Explanation
The primitive streak develops during week 3 of pregnancy. This is an important stage in embryonic development where the cells in the epiblast (a layer of cells in the embryo) migrate and form a groove-like structure called the primitive streak. The primitive streak is the first visible sign of the formation of the three germ layers (ectoderm, mesoderm, and endoderm) which give rise to all the different tissues and organs in the body.

Explanation
The gastrointestinal tract develops from the endoderm, which is one of the three primary germ layers in the early embryo. The endoderm gives rise to the innermost layer of the digestive system, including the lining of the stomach, intestines, and other associated organs. This layer is responsible for the absorption and digestion of food. The ectoderm gives rise to the outer layer of the skin and nervous system, while the mesoderm gives rise to the middle layer, which includes muscles, connective tissues, and some internal organs.

Explanation
During embryonic folding, the endoderm layer of cells moves inward and becomes surrounded by the ectoderm layer. This process is known as endoderm invagination. As a result, the endoderm will be inside of the ectoderm.

Explanation
From weeks 2 through 8 of human gestation, the developing human is referred to as an embryo. This is the stage of development after the zygote has gone through several cell divisions and has formed a solid ball of cells called a morula. At this stage, the embryo implants itself into the uterine wall and begins to develop specialized tissues and organs. The blastocyst stage occurs prior to the formation of the embryo, when the zygote has formed a hollow ball of cells. Therefore, the correct answer is embryo.