Question

Blastopore is the pore of ?

Answer 1

Blastopore is the opening by which the cavity of the gastrula (an embryonic stage in animal development) communicates with the exterior. During maturation of some animals it evolves into the anus or the mouth; in others it is covered over and contributes to the canal joining the primitive gut with the cavity of the neural tube, the primitive nervous system. Blastopore is the pore of Archenteron.

Archenteron (definition) :- The primary gut that forms during gastrulation in the developing zygote is known as the archenteron or digestive tube. It develops into the endoderm and mesoderm of an animal.

As primary mesenchyme cells detach from the vegetal pole in the gastrula and enter the fluid filled cavity in the center (the blastocoel), the remaining cells at the vegetal pole flatten to form a vegetal plate. This buckles inwards towards the blastocoel in a process called invagination. The cells continue to be rearranged until the shallow dip formed by invagination transforms into a deeper, narrower pouch formed by the gastrula endoderm. This narrowing and lengthening of the archenteron is driven by convergent extension.

So, the open end of the archenteron is called the blastopore.