Coelomates Quiz and Flashcards: Characteristics and Types

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Questions and Answers

What type of body plan is exhibited by animals like annelids and arthropods?

Asymmetry

Radial symmetry

Bilateral symmetry (correct)

Spherical symmetry

Which of the following animals are diploblastic?

Chordates

Echinoderms

Coelenterates (correct)

Platyhelminthes

What is the term for the layer of cells in between the ectoderm and endoderm in diploblastic animals?

Mesoglea (correct)

Germ layer

Mesoderm

Coelom

Which of the following animals are triploblastic?

Platyhelminthes to chordates Signup and view all the answers

What is the term for the body cavity lined by mesoderm?

Coelom Signup and view all the answers

Which of the following is a characteristic used in classification?

Presence or absence of a coelom Signup and view all the answers

Which of the following animals have a coelom?

Echinoderms Signup and view all the answers

What is the term for the body cavity that is not lined by mesoderm?

Pseudocoelom Signup and view all the answers

What is the term for animals that possess a body cavity lined by mesoderm?

Coelomates Signup and view all the answers

Which of the following is an example of a coelomate?

Annelids Signup and view all the answers

What is the term for the body cavity in animals where the mesoderm is present as scattered pouches?

Pseudocoelom Signup and view all the answers

Which of the following is characterized by the presence of a notochord?

Chordates Signup and view all the answers

What is the term for the phenomenon of serial repetition of organs in some animals?

Metamerism Signup and view all the answers

Which of the following is an example of an acoelomate?

Platyhelminthes Signup and view all the answers

What is the term for the body cavity in animals where the mesoderm is absent?

Acoelom Signup and view all the answers

Which of the following groups of animals exhibit triploblastic organisation?

Annelids Signup and view all the answers

Which of the following phyla exhibits bilateral symmetry?

Ctenophora Signup and view all the answers

What is the characteristic of the coelom in the phylum Annelida?

Present Signup and view all the answers

Which of the following phyla exhibits triploblastic organisation?

Annelida Signup and view all the answers

What is the characteristic of the digestive system in the phylum Cnidaria?

Incomplete Signup and view all the answers

Which of the following phyla exhibits diploblastic organisation?

Cnidaria Signup and view all the answers

What is the characteristic of the coelom in the phylum Aschelminthes?

Pseudo Signup and view all the answers

Which of the following phyla exhibits pseudocoelomate organisation?

Aschelminthes Signup and view all the answers

What is the characteristic of the body organisation in the phylum Annelida?

Segmentation like rings Signup and view all the answers

Study Notes

Body Organization

Coelomates: animals with a body cavity lined by mesoderm, e.g., annelids, molluscs, arthropods, echinoderms, hemichordates, and chordates.
Pseudocoelomates: animals with a body cavity not lined by mesoderm, but instead, mesoderm is present as scattered pouches between ectoderm and endoderm, e.g., aschelminthes.
Acoelomates: animals without a body cavity, e.g., platyhelminthes.

Segmentation

Metameric segmentation: the body is externally and internally divided into segments with a serial repetition of at least some organs, e.g., earthworm.
Metamerism: the phenomenon of serial repetition of organs.

Notochord

Notochord: a mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals.
Chordates: animals with a notochord, e.g., some animals from embryonic development.
Non-chordates: animals without a notochord, e.g., porifera to echinoderms.

Body Symmetry

Bilateral symmetry: the body can be divided into identical left and right halves in only one plane, e.g., annelids, arthropods.
Radial symmetry: the body can be divided into identical parts around a central axis, e.g., coelenterates, ctenophores, and echinoderms.

Germinal Layers

Diploblastic organization: animals with two embryonic layers, an external ectoderm and an internal endoderm, e.g., coelenterates.
Triploblastic organization: animals with three germinal layers, an external ectoderm, an internal endoderm, and a mesoderm in between, e.g., platyhelminthes to chordates.

Coelom

Coelom: a body cavity lined by mesoderm, present in some animals, e.g., annelids, molluscs, arthropods, echinoderms, hemichordates, and chordates.

Phylum Characteristics

Porifera: cellular organization, absent symmetry, absent coelom, absent segmentation, and absent digestive, circulatory, and respiratory systems.
Coelenterata (Cnidaria): tissue organization, radial symmetry, absent coelom, absent segmentation, and incomplete digestive system.
Ctenophora: tissue organization, radial symmetry, absent coelom, absent segmentation, and incomplete digestive system.
Platyhelminthes: organ organization, bilateral symmetry, absent coelom, absent segmentation, and incomplete digestive system.
Aschelminthes: organ organization, bilateral symmetry, pseudocoelomate, absent segmentation, and complete digestive system.
Annelida: organ organization, bilateral symmetry, coelomate, present segmentation, and complete digestive system.