Question

Which of the following animal does not belong to the phylum Echinodermata?

• A. Starfish
• B. Echinoidea
• C. Sea cucumber
• D. Chiton

Answer 1

The correct option is D

Chiton

The correct option is D.

Explanation of correct option:

1. Chiton belongs to the phylum Mollusca.
2. They are triploblastic and bilaterally symmetrical.
3. They exhibit organ system level of organization.
4. They have a muscular foot that helps in locomotion.
5. Symmetrical marine mollusks are abundant in warm regions.

Explanation of incorrect options:

Option A

1. Starfish belongs to the phylum Echinodermata.
2. They have a star-like appearance.
3. The skeleton is made up of calcium carbonate.

Option B

1. Sea urchins are spiny and globular in the class Echinoidea.
2. They are free-moving echinoderms covered with spines.
3. They have pentaradial symmetry.

Option C

1. Sea cucumbers are echinoderms.
2. They are soft-bodied sea animals.
3. They use tentacles for locomotion and feeding.

Final answer: Chiton does not belong to the phylum Echinodermata