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Questions and Answers
What type of body plan is exhibited by animals like annelids and arthropods?
Which of the following animals are diploblastic?
What is the term for the layer of cells in between the ectoderm and endoderm in diploblastic animals?
Which of the following animals are triploblastic?
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What is the term for the body cavity lined by mesoderm?
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Which of the following is a characteristic used in classification?
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Which of the following animals have a coelom?
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What is the term for the body cavity that is not lined by mesoderm?
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What is the term for animals that possess a body cavity lined by mesoderm?
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Which of the following is an example of a coelomate?
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What is the term for the body cavity in animals where the mesoderm is present as scattered pouches?
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Which of the following is characterized by the presence of a notochord?
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What is the term for the phenomenon of serial repetition of organs in some animals?
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Which of the following is an example of an acoelomate?
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What is the term for the body cavity in animals where the mesoderm is absent?
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Which of the following groups of animals exhibit triploblastic organisation?
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Which of the following phyla exhibits bilateral symmetry?
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What is the characteristic of the coelom in the phylum Annelida?
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Which of the following phyla exhibits triploblastic organisation?
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What is the characteristic of the digestive system in the phylum Cnidaria?
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Which of the following phyla exhibits diploblastic organisation?
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What is the characteristic of the coelom in the phylum Aschelminthes?
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Which of the following phyla exhibits pseudocoelomate organisation?
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What is the characteristic of the body organisation in the phylum Annelida?
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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.
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Description
Learn about the features of coelomates, including annelids, molluscs, and arthropods, and their body cavity structures.
