Question

With which of the following can epidermis and gastrodermis of cnidarians be compared?

• A. Epidermis and endodermis of coelomates
• B. Pinacoderm and choanoderm of sponges
• C. Epidermis and mesoderm of annelida
• D. None of the above

Answer 1

Answer: (B)

Pinacoderm and choanoderm of sponges

Pinacoderm is the outer most layer of Porifera. The epidermis of cnidarians is the outermost and contains the cnidocysts, the stinging cells which are used for prey capture and defense from predators.
Choanoderm is the innermost type of cell layer composed of flagellated collar cells in sponges. Gastrodermis is the simple innermost tissue that lines the digestive cavity of cnidarian.
Therefore, the correct answer is option B.