Question

Archenteron is lined with
A. Ectoderm
B. Mesoderm
C. Endoderm
D. Mesoderm and Endoderm

Answer 1

Hint: When the zygote is in the developing stage, its primary gut that forms during gastrulation is known as the Archenteron of the digestive tube. During gastrulation, this Archenteron develops and becomes the digestive tube. Along with it, the blastopore develops into a mouth (that is, protostome) or in the anus (that is, deuterostome).

Complete Answer:
- Gastrulation is a phase in embryonic development of most animals. During this stage, the blastula that is a single-layered sphere of cells which is hollow from within, is reorganised into a multi-layered structure known as Gastrula.
- When the process of gastrulation starts in the archenteron cavity, that is the primitive gut, during the process, some cells start moving in an inward direction and the process is termed as invagination.
- On the other hand, the three primary cell layers, which are also known as germ layers that form during the earlier stages of embryonic development are the endoderm (inner layer), the mesoderm (middle layer) and the ectoderm (outer layer).
- The internal cellular mass of the blastocyst, which is formed after five days of fertilization, gets separated into outer ectoderm, middle mesoderm and inner endoderm. The cavity found inside the endoderm or the coelom that is developed into the primary gut also known as the archenteron is lined or covered by the endoderm cells.

Thus, we can say that Archenteron is lined with endoderm.

Note: The archenteron of the digestive tube forms when the zygote is in the developing stage. During gastrulation, this Archenteron develops and becomes the digestive tube. Gastrulation is a phase in embryonic development of most animals. When the process of gastrulation starts in the archenteron cavity, that is the primitive gut, during the process, some cells start moving in an inward direction and the process is termed as invagination. The cavity found inside the endoderm or the coelom that is developed into the primary gut also known as the archenteron is lined or covered by the endoderm cells.