Write the general characters of the class Chondrichthyes. - Vidyadip

Question

Write the general characters of the class Chondrichthyes.

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Answer

They are cartilaginous marine fishes. .
The notochord is persistent throughout life.
The skin is covered by dermal placoid. scales.
Caudal fin is heterocercal.
Jaws are powerful.
Respiration is by lamelliform gills without operculum.
Mesonephric kidneys are present.
They have two-chambered hearts.
They are ureotelic.
They are poikilothermic and viviparous.
Sexes are separate and fertilization is internal, e.g., Scoliodon.

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