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  •  Chondrichthyes is characterised by Option: 1 Placoid scale Option:

 Chondrichthyes is characterised by 

Option: 1

Placoid scale 


Option: 2

Ventral mouth 


Option: 3

Ctenoid scale and ventral mouth 


Option: 4

Placoid scale and ventral mouth 


Answers (1)

best_answer

 

 

Class Chondrichthyes - Characteristics Features -

  • This class contains the fishes with cartilaginous endoskeleton.

  • Sharks, rays, skates, saw-fishes etc. belong to this class.

  • The notochord persists throughout their life

  • They have a tough skin covered with placoid scales.

  • They have powerful jaws with modified placoid scales called the teeth. The mouth is ventrally located.

  • The gill slits are not protected by an operculum.

  • They do not have a swim bladder due to which they swim continuously to prevent sinking.

  • They have a two-chambered heart with one atrium and one ventricle.

  • They are cold-blooded.

  • They have separate sexes. Fertilization occurs internally. They can be oviparous or viviparous.

 

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 Cartilaginous fishes have placoid scale and ventral mouth.

Posted by

HARSH KANKARIA

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