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Questions and Answers
What term describes animals that possess a body cavity lined by mesoderm?
Which of the following terms refers to animals that lack a body cavity?
Which of the following is an example of a pseudocoelomate?
What is the phenomenon called when an animal’s body is divided into segments with repeated structures?
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What embryonic structure is characteristic of chordates?
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Which animal group is an example of coelomates?
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Which of the following correctly describes pseudocoelomates?
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What type of segmentation is exhibited by earthworms?
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Which of the following groups includes both chordates and non-chordates?
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Study Notes
Coelom
- Coelom refers to the body cavity lined by mesoderm, crucial for animal classification.
- Coelomates include animals such as annelids, molluscs, arthropods, echinoderms, hemichordates, and chordates.
- Pseudocoelom is an unlined body cavity found in some animals, where mesoderm forms scattered pouches; examples include aschelminthes (pseudocoelomates).
- Acoelomates lack a body cavity entirely, represented by platyhelminthes.
Segmentation
- Metameric segmentation involves the external and internal division of the body into segments with repeated organ arrangements.
- Earthworms demonstrate metamerism, showcasing this pattern of segmentation.
Notochord
- Notochord is a rod-like structure derived from mesoderm, forming during embryonic development in certain animal groups.
- Chordates possess a notochord, while non-chordates do not; examples of non-chordates range from porifera to echinoderms.
Classification of Animals
- Animalia is classified broadly based on fundamental features such as presence of coelom, segmentation, and notochord.
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Description
Learn about the importance of coelom in animal classification, coelomates, and the difference between coelom and pseudocoelom. Understand the characteristics of various animal groups, including annelids, molluscs, and more.
