Question

Elasmobranchs lack

• A. Gill slits
• B. Operculum
• C. Notochord
• D. Placoid scales

Answer 1

The correct option is B Operculum

A. Gill slits are the openings of gills.

B. Operculum is the gill cover.

C. Notochord is the cartilaginous rod in skeletal system. It may be present at either embryonic stage or adult stage or both.

D. Placoid scales are the appendages on the body of fishes and look like teeth of vertebrates.

Elasmobranchs is a group of cartilaginous fishes and lack operculum.

So, the correct answer is 'Operculum'.