Class Osteichthyes


 
 
Concept Explanation
 

Class Osteichthyes

This class includes bony fish, or fish with a skeleton of bone. Their characteristics are :

  • These fish have ctenoid or cycloid scales which are different from those of cartilaginous fish.
  • Unlike cartilaginous fish, they have gills covered by an operculum.
  • Their fins are membranous, while those of cartilaginous fish are fleshy.
  • Many bony fish have an air-filled swim bladder to help them float. They have a two-chambered heart.
  • Some are marine, while some live in freshwater and in most fertilization is external.
  • Most of the fish we eat, like herring, trout, carp, perch and salmon, are bony fish. Sea horse (Hippocampus) and lung fish (Protopterus) are also bony fish.
  • Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    The fish shown in the figure is the member of 

                 

    Right Option : C
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    Explanation
    Question : 2

    Identify the organism which shows the following features -

    (i) Water living

     (ii) Skin covered with scales/plates

    (iii) Obtain O_2 dissolved in water by using gills

     (iv) Cold blooded and

    (v) heart two chambered

    Right Option : C
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    Explanation
    Question : 3

    Which type of scales are present in the class Osteichthyes ?

    Right Option : B
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    Explanation
     
     
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