Class Chondrichthyes


 
 
Concept Explanation
 

Class Chondrichthyes

Class Chondrichthyes: These are cartilaginous fish, i.e., their skeleton is made of cartilage. Their characteristics are :

  • They are mostly marine.
  • The body is either shaped like a spindle or like a flattened disc. Their scales, called placoid scales, are different from those of bony fish.
  • They breathe through gills which are not covered by an operculum. An operculum is like a bony flap.
  • The heart has two chambers. Cartilaginous fish are unisexual and fertilization is internal.
  • Example: Sharks, sting rays, electric rays, dogfish, Cow fish, Flying fish etc.

                                                          

                                                  

     

     

    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Dog fish belongs to the class of _____________ .

    Right Option : A
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    Question : 2

    Fishes respire through gills. The gills may or may not be covered with the operculum. The gills which are not covered by the operculum are present in which of these class ?

    Right Option : B
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    Explanation
    Question : 3

    The members of class Chondrichthyes are mostly ______________________ .

    Right Option : A
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    Explanation
     
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