Question

Cartilaginous fishes do not contain:

• A. Fins
• B. Gill cover/operculum
• C. Mouth
• D. Scales

Answer 1

Answer: (B)

The correct option is B Gill cover/operculum

Cartilaginous fishes have a cartilaginous exoskeleton and belong to class Chondrichthyes. Example: Sharks.

Their characteristics are:

• Broad paired fins and caudal fin.
• Gills are not covered by an operculum (gill cover).
• Exoskeleton contains placoid scales which are dermal in origin.
• Mouth is ventral.

Cartilaginous fishes do not contain gill cover/operculum. So, the correct answer is 'Gill cover/operculum'.