Diversity in Living Organisms — Science STD 9 — Question
Gujarat BoardEnglish MediumSTD 9ScienceDiversity in Living Organisms2 Marks
Question
Define the terms and give one example: Coelom.
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Answer
Coelom is the body cavity present between the body wall and the gut wall. Presence or absence of coelom is very important basis of classification. Example:
Acoelomate: Coelom is absent, e.g., poriferous, coelentrates, ctenophores and flatworms.
Pseudocoelomate: The body cavity is not lined by mesoderm instead it is present as scattered pouches in between mesoderm and endoderm. e.g., round worms.
Eucoelomate: Presence of true coelom. True coelom is of two types.
Schizocoelom Develops by splitting up of mesoderm.
Enterocoelom The mesoderm arises from wall of embryonic gut.
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