Question

The surface of an echinoderm body, where the mouth is formed is termed as ____.

• A. Oral surface
• B. Aboral surface
• C. Lateral surface
• D. Vascular surface

Answer 1

The correct option is A

Oral surface

The surface of the body of an echinoderm, where the mouth is situated is called the oral surface, which is usually on the ventral side (bottom of animals like starfish), while the opposite surface is called the aboral surface, where the anus is situated. The latter is typically on the dorsal side (the top surface of animals like starfish).