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Animal Kingdom — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYAnimal Kingdom1 Mark
MCQ
Cartilaginous fishes do not contain:
  • A
    Fins
  • B
    Gill cover/ operculum
  • C
    Scales
  • D
    Mouth
✓

Answer

  1. Gill cover/ operculum

Explanation:

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.

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