Name the type of animal body cavity each of the following diagrams represents.
Name the type of animal body cavity each of the following diagrams represents.
The correct option is D 1 - Acoelomate, 2 - Pseudocoelomate, 3 - Coelomate
Based on the type of body cavity, animals (mainly the triploblastic animals) are grouped into acoelomate, pseudocoelomate and eucoelomate animals. Animals in which the body cavity is totally absent, and is merely filled up with tissue, are called acoelomate. Flatworms (Phylum Platyhelminthes) are a good example of this. Those animals in which the body cavity is not lined by the mesoderm, and instead, the mesoderm is present as scattered pouches in between the ectoderm and
endoderm, are known as pseudocoelomate animals. The pseudocoelom is basically a fluid-filled body cavity lying inside the external body wall that bathes the internal organs, including the alimentary system and the reproductive system. This body cavity is called a “pseudocoelom” because it is not fully lined by mesodermal cells as in the true “coelomic cavity” of coelomate animals. An example of this type would be the roundworms (Phylum Aschelminthes). The body cavity, which is lined by mesoderm is called coelom. Animals possessing such a coelom are called coelomates. Examples include the annelids, molluscs, arthropods, echinoderms, hemichordates and chordates.
1 - Acoelomate, 2 - Pseudocoelomate, 3 - Coelomate
Based on the type of body cavity, animals (mainly the triploblastic animals) are grouped into acoelomate, pseudocoelomate and eucoelomate animals. Animals in which the body cavity is totally absent, and is merely filled up with tissue, are called acoelomate. Flatworms (Phylum Platyhelminthes) are a good example of this. Those animals in which the body cavity is not lined by the mesoderm, and instead, the mesoderm is present as scattered pouches in between the ectoderm and
endoderm, are known as pseudocoelomate animals. The pseudocoelom is basically a fluid-filled body cavity lying inside the external body wall that bathes the internal organs, including the alimentary system and the reproductive system. This body cavity is called a “pseudocoelom” because it is not fully lined by mesodermal cells as in the true “coelomic cavity” of coelomate animals. An example of this type would be the roundworms (Phylum Aschelminthes). The body cavity, which is lined by mesoderm is called coelom. Animals possessing such a coelom are called coelomates. Examples include the annelids, molluscs, arthropods, echinoderms, hemichordates and chordates.
