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Question

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


A

Starfish

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B

Echinoidea

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C

Sea cucumber

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D

Chiton

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Solution

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


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