Class Aves


 
 
Concept Explanation
 

Class Aves

Class Aves (Latin. Avis : bird)

Aves include all birds. Birds are often described as ‘feathered reptiles with the power of flight’.

Characteristics of Aves are :

  • The body is streamlined to reduce air resistance during flight.
  • The skin is covered by feathers, the forelimbs are modified into wings, but the hindlimbs have scales. 
  • The skeleton is strong but light, and the limb bones are hollow, with air sacs to make flying easier. 
  • Birds do not have teeth or strong jaws, but they have hard beaks. These beaks are modified according to their feeding habits.
  • Birds are warm-blooded , i.e., their temperature does not depend on that of the surroundings.
  • They have a four-chambered heart with two auricles and two ventricles.
  • They breathe through lungs. They do not have pleural cavity like us. They also have bronchi that ends up into the air sacs. 
  • Fertilization is internal and the fertilized eggs are laid with yolk and a hard shell.
  • There are also some flightless birds that cannot fly. Some of the examples are Ostrich and Emu.
  • Some common birds are crow (Corvus), pigeon (Columba) and sparrow (Passer). There are some birds that are good runners, but they cannot fly, for example, ostrich.

                   

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

    ____________________ is not a characteristic feature of Aves.

    Right Option : A
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    Explanation
    Question : 2

    ______________ are warm - blooded animals, have a four chambered heart and lay eggs.

    Right Option : D
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    Explanation
    Question : 3

    __________________ is a flightless bird.

    Right Option : B
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    Explanation
     
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