Question

Ambulacral grooves of Asterias are present on

• A. Oral surface
• B. Aboral
• C. Both of A and B
• D. None of the above

Answer 1

The correct option is A Oral surface

Asterias is commonly known as the star fish. This organism belongs to the phylum of echinoderms. They have radial type of symmetry because there are five tentacles which have been modified to form the tube feet. There are ambulacral grooves which are present on the oral surface of Asterias. These grooves extends from the mouth to the tip of arms. They carry ambulacral ossicles which are fitted together throughout the surface of the tube feet. These are ossicles or plate like structures which are present on the surface of the organism.

Thus, the correct answer is option A.