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Questions and Answers
What term describes animals that possess a body cavity lined by mesoderm?
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 terms refers to animals that lack a body cavity?
Which of the following is an example of a pseudocoelomate?
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?
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?
What embryonic structure is characteristic of chordates?
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Which animal group is an example of coelomates?
Which animal group is an example of coelomates?
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Which of the following correctly describes pseudocoelomates?
Which of the following correctly describes pseudocoelomates?
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What type of segmentation is exhibited by earthworms?
What type of segmentation is exhibited by earthworms?
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Which of the following groups includes both chordates and non-chordates?
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.
