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Questions and Answers
What is the body cavity lined by mesoderm called?
What is the body cavity lined by mesoderm called?
- Acoelom
- Coelom (correct)
- Pseudocoelom
- Hemocoel
Which of the following animals is classified as a coelomate?
Which of the following animals is classified as a coelomate?
- Sponges
- Earthworm (correct)
- Flatworm
- Nematode
What term is used for animals that lack a body cavity?
What term is used for animals that lack a body cavity?
- Coelomates
- Acoelomates (correct)
- Metameres
- Pseudocoelomates
Which characteristic is associated with metameric segmentation?
Which characteristic is associated with metameric segmentation?
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What do we call animals that develop a mesoderm between ectoderm and endoderm?
What do we call animals that develop a mesoderm between ectoderm and endoderm?
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Which of the following classifications includes animals without a notochord?
Which of the following classifications includes animals without a notochord?
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Which animal group is an example of pseudocoelomates?
Which animal group is an example of pseudocoelomates?
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What is a notochord?
What is a notochord?
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Study Notes
Coelom
- Coelom: A body cavity lined by mesoderm, vital for animal classification.
- Animals with a coelom are termed coelomates, examples include annelids, mollusks, arthropods, echinoderms, hemichordates, and chordates.
- Pseudocoelom: A body cavity not fully lined by mesoderm, found in pseudocoelomates like aschelminthes.
- Acoelomates: Animals with no body cavity, represented by platyhelminthes.
- Triploblastic animals possess a third germ layer, mesoderm, located between ectoderm and endoderm.
Segmentation
- Metamerism: The body is segmented, with repetition of some organs.
- Example: Earthworms exhibit metameric segmentation, distinguishing them by body organization.
Notochord
- Notochord: A mesodermal, rod-like structure formed on the dorsal side during early development.
- Chordates: Animals possessing a notochord, contrasting with non-chordates, which lack this structure (e.g., from porifera to echinoderms).
Classification of Animals
- Animals are broadly classified based on fundamental features, with emphasis on body cavity, segmentation, and presence of notochord.
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