Questions and Answers
What is the body cavity lined by mesoderm called?
Which of the following animals is classified as a coelomate?
What term is used for animals that lack a body cavity?
Which characteristic is associated with metameric segmentation?
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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?
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Which animal group is an example of pseudocoelomates?
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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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Description
This quiz covers the concept of coelom in the Animal Kingdom, focusing on the presence and absence of body cavities in various animal classifications. It explains the significance of coelomates and highlights examples such as annelids, molluscs, and echinoderms. Test your knowledge on animal anatomy and classification principles.
