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

    In _____________________ of the following the heart is two chambered.

    Right Option : D
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    Explanation
    Question : 2

    Sharks, sting rays, electric rays and dogfish fall under ____________ class.

    Right Option : C
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    Explanation
    Question : 3

    Which one is a true fish?
     

    Right Option : C
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    Explanation
     
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