Question

Which of the following is not a characteristic of phylum Ctenophora?

• A. They are exclusively marine, radially symmetrical animals
• B. They move by cilia, which join together to form eight median comb plates
• C. When the tentacles are present they are two in number and contain cnidoblasts
• D. Reproduction takes place only by sexual means

Answer 1

The correct option is A They are exclusively marine, radially symmetrical animals

The phylum ctenophore is exclusively marine animals. Symmetry is biradial (radial + bilateral). The arrangement of comb plates gives the appearance of radial symmetry; the tentacles and branching of gastrovascular canals are of a bilateral type. So the correct option is 'They are exclusively marine, radially symmetrical animals'.