Nudibranchs, a type of predatory sea slug, can have various protuberances (i.e., extensions) on their dorsal surfaces. Rhinophores are paired structures, located close to the head, which bear many chemoreceptors. Dorsal plummules, usually located posteriorly, perform respiratory gas exchange. Cerata usually cover much of the dorsal surface and contain nematocysts at their tips.
-The spiracles and tracheae of insects have a function most similar to that of
A) rhinophores.
B) dorsal plummules.
C) cerata.
D) more than one of these.

Question

Quizplus · Accepted Answer

The function of respiratory gas exchange is performed by dorsal plummules in nudibranchs, and this function is most similar to that of spiracles and tracheae in insects, which also facilitate gas exchange. Rhinophores are involved in chemoreception, and cerata contain nematocysts for defense and possibly food capture.

Nudibranchs, a Type of Predatory Sea Slug, Can Have Various