Question

In Balanoglossus:

• A. Sexes are united and fertilization is external
• B. Sexes are separate and fertilization is external
• C. Sexes are separate and fertilization is internal
• D. Sexes are united and fertilization is internal

Answer 1

The correct option is B Sexes are separate and fertilization is external

Balanoglossus is a hemichordate acorn worm. It is the connecting link between invertebrates and vertebrates. It is basically a bottom-dwelling marine worm. It is tubicolous, that is, lives inside U-shaped burrows or tubes in the sand. In Balanoglossus, the sexes are separate and prominent sexual dimorphism does not exist and fertilization is external, that is, it takes place outside the body of the organism.

So, the correct answer is 'Sexes are separate and fertilization is external.'.