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  •  In sharks, one of the following is absent:Option: 1 Claspers <str

 In sharks, one of the following is absent:

Option: 1

Claspers 


Option: 2

Placoid scales 


Option: 3

Air bladder


Option: 4

Cartilaginous endoskeleton 


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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 chondrichthyes do not have a swim or air bladder.

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Nehul

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