Question

Select odd one with respect to Echinodermata

• A. Echinus
• B. Asterias
• C. Holothuria
• D. Chiton

Answer 1

The correct option is D

Chiton

The correct option is D.

Explanation of the correct option :

1. Chitons are marine mollusks belonging to Phylum-Mollusca
2. They have an elongated, oval, dorsoventrally flattened, bilaterally symmetrical body.
3. They have the unique dorsal shell of eight plates embedded within a mantle.
4. The valves are protected by a thick girdle, covered by spines, scales, or hairs.
5. They have large, muscular ventricle feet which act as a suction pump for locomotion.

Explanation of the incorrect option :

Option A:

Echinus is a common sea urchin, belonging to the phylum Echinodermata.

Option B:

Asterias is the common starfish, belonging to phylum Echinodermata.

Option C:

Holothuria is a marine invertebrate, commonly known as black sea cucumber or lolly fish belongs to the phylum Echinodermata.

Final answer: Chiton is the odd one with respect to Echinodermata.