Blastopore is the opening of:a)Blastocoelb)Coelenteronc)Gastrocoeld)ArchenteronCorrect answer is 'D'. Can you explain this answer?

Question

Answer

Archaenteron is the primitive gut formed from embryonic endoderm. Its opening is called blastopore. If blastopore forms anus, organisms are called deuterostomia (echinoderms and chordates) whereas if it forms mouth, then organisms are referred to as protostomia (all other phyla).

Answer

Blastopore is an opening through which the cavity of the gastrula i.e ^^archenteron^^, connects with the exterior. This blastopore forms the mouth in the lower animals i.e the protostomes. In the higher animals, the deuterostomes, the blastopore forms the anus.

Answer

Gastrocoel is the correct answer.

Answer

Explanation:

The blastopore is the opening that forms during the early stages of embryonic development in animals. It is an important structure that gives rise to various body cavities and structures in different animal groups. In the case of this question, the correct answer is option 'D', which states that the blastopore is the opening of the archenteron.

Archenteron:
The archenteron is the primary gut or digestive cavity that forms during gastrulation in animal embryos. It is a cavity that develops from the blastocoel, the fluid-filled cavity that forms during the early stages of embryonic development. The archenteron is formed when cells invaginate or fold inward, creating a tube-like structure.

Blastopore:
The blastopore is the initial opening that appears during gastrulation. It is formed when cells on the surface of the embryo move inward, causing the embryo to fold in on itself. The blastopore is the site where the cells invaginate to form the archenteron. In some animals, such as amphibians, the blastopore eventually develops into the anus, while in others, such as the chordates, it becomes the mouth.

Other Options:
- Blastocoel: The blastocoel is the fluid-filled cavity that forms during the early stages of embryonic development. It is surrounded by a layer of cells known as the blastoderm, which gives rise to the embryo. While the blastopore is related to the blastocoel, it is not the opening of the blastocoel itself.
- Coelenteron: The coelenteron is the central cavity found in cnidarians, such as jellyfish and corals. It is a primitive digestive cavity that is not directly related to the blastopore.
- Gastrocoel: The gastrocoel is the cavity found in the body of a gastrula that gives rise to the digestive system. It is also not directly related to the blastopore.

Therefore, the correct answer is option 'D', as the blastopore is indeed the opening of the archenteron, the primary gut cavity that forms during gastrulation in animal embryos.

Answer

2

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