Question

Which of the following features is NOT present in the phylum Porifera?

• A. Cellular level of organization
• B. Intracellular digestion
• C. Alternation of polyp and medusa generations
• D. Skeleton made up of spicules or fibres

Answer 1

The correct option is C Alternation of polyp and medusa generations

The phylum Porifera is represented by sponges. Animals of this phylum have the cellular level of organization, they perform intracellular digestion and their skeleton is made up of spicules or fibers called the spongin fibers. This spongin is secreted by the mesenchymal cells. The alternation of polyp and medusa generations is shown by the phylum Coelenterata.

Hence, the correct answer is 'Alternation of polyp and medusa generations'.