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GMAS Biology Practice Test

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A body cavity that is not completely lined by tissue derived from mesoderm is called what?
Correct Answer:
Pseudocoelom
Explanation:
This question tests how the lining of a body cavity distinguishes different animal groups. A cavity that is not completely lined by tissue derived from mesoderm is called a pseudocoelom, a “false” body cavity. In pseudocoelomates, the gut is lined by endoderm, while the outer part of the body cavity is lined by mesoderm, so the cavity isn’t entirely surrounded by mesoderm-derived tissue. This contrasts with a true coelom, which is entirely lined by mesoderm and forms a true body cavity in coelomates. Exoskeleton and endoskeleton describe skeletal support, not cavities, so they aren’t the right fit here.

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