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

    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 : 2

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

    Right Option : C
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    Explanation
    Question : 3

    Which of the following is true fish ?

    Right Option : C
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    Explanation
     
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