Question

Identify the given developmental stage of human embryo and select the correct option regarding it.

• A. Developmental stage- Blastocyst, Site of implantation- Uterine wall
• B. Developmental stage- Morula, Site of implantation- Uterine wall
• C. Developmental stage- Blastula, Site of implantation- Mid part of fallopian tube
• D. Developmental stage- Gastrula, Site of implantation- Mid part of fallopian tube

Answer 1

The correct option is A Developmental stage- Blastocyst, Site of implantation- Uterine wall

The blastocyst is formed after 5-6 days of fertilization. It is composed of two types of cell with a central cavity. 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 known as the blastocoele. The trophoblast gives rise to the placenta.

So, the correct answer is option A.