Which pair are pseudocoelomates?

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Prepare for the Diversity of Life Test. Explore diverse biological concepts through multiple choice questions, with hints and explanations included. Get exam-ready now!

Multiple Choice

Which pair are pseudocoelomates?

Explanation:
Pseudocoelomates have a fluid-filled body cavity called a pseudocoel that lies between the gut and the body wall and is only partially lined by mesoderm, not a complete coelom. Nematodes and rotifers share this arrangement, with their cavities formed differently from a true coelom. In contrast, flatworms lack a body cavity entirely (acoelomates), while annelids and mollusks have a true coelom completely lined by mesoderm (eucoelomates). That's why nematodes and rotifers are the pseudocoelomate pair.

Pseudocoelomates have a fluid-filled body cavity called a pseudocoel that lies between the gut and the body wall and is only partially lined by mesoderm, not a complete coelom. Nematodes and rotifers share this arrangement, with their cavities formed differently from a true coelom. In contrast, flatworms lack a body cavity entirely (acoelomates), while annelids and mollusks have a true coelom completely lined by mesoderm (eucoelomates). That's why nematodes and rotifers are the pseudocoelomate pair.

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