Question

The anterior part of Amphioxus is

• A. Oral hood
• B. Rostrum
• C. Mouth
• D. Both A and B

Answer 1

Answer: (B)

Rostrum

Amphioxus is a cephalochordate.

A) Oral hood is a prolongation that surrounds the oral hood and bears the oral cirri. It is not the anterior part of amphioxus.

B) Rostrum is the anterior-most part of amphioxus as it projects over the oral hood.

C) Mouth in amphioxus is located at the level of the oral hood as it is surrounded by it and is not the anterior part.

So, the correct answer is 'Rostrum'.