Multiple choice

Which of the following is absent in cartilaginous fishes?

  1. Gill slits

  2. Operculum

  3. Flesh fins

  4. Ventral mouth

  5. Gills

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Operculum, i.e. gill cover is absent in cartilaginous fishes and gill slits are visible.