Choose the correct option.

Annelids - Pseudocoelomates

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Platyhelminthes - Acoelomates

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Aschelminthes - Acoelomates

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Platyhelminthes - Coelomates

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Solution

The correct option is B Platyhelminthes - Acoelomates
Animals possessing coelom are called coelomates. In coelomates, the body cavity is lined by mesoderm. Example - annelids, molluscs, arthropods, echinoderms, hemichordates and chordates.

In some animals, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm. Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates. Example - aschelminthes.

The animals in which the body cavity is absent are called acoelomates. Example - platyhelminthes.

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Similar questions

Assertion [A] : Platyhelminthes are acoelomates.

Reason [R] : In platyhelminthes the coelom is filled with a packing tissue called mesenchyme.

\begin{matrix} P h y l u m & G e r m l a y e r & B o d y c a v i t y (1) __________ & Triploblastic & Acoelomates Aschelminthes & Triploblastic & (2) __________Annelida & (3) ________ & Eucoelomates \end{matrix}

Assertion [A]: Platyhelminths are acoelomates.

Reason [R]: Platyhelminths develop three primary germ layers during early embryogenesis.

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