Question

Which of the following is not associated with the phylum Echinodermata?

• A. The phylum includes sea stars and sea urchins.
• B. Echinoderms reproduce sexually.
• C. The phylum includes crayfish.
• D. Echinoderms are heterotrophs.
• E. Echinoderms are invertebrates.

Answer 1

Answer: (C)

The phylum includes crayfish.

Phylum Echinodermata includes starfish, sea urchins, brittle stars, sea cucumbers. Echinoderms are invertebrates which are heterotrophic. Sexes are usually separate, fertilization external, development indirect leading to the formation of a bilateral ciliated larva which metamorphoses into radially symmetrical adult. Crayfish belongs to phylum Arthropoda and thus they are not associated with phylum Echinodermata.

So, the correct answer is option C.