Class Mammalia


 
 
Concept Explanation
 

Class Mammalia

Class Mammalia: Most mammals are terrestrial. Whales, dolphins, seals and walruses are some aquatic mammals. Mammals have two pairs of limbs and their body is covered with hair.  Their characteristics are :

  • The skin has sudorific (sweat) and sebaceous (oil) glands.
  • There are four types of teeth buried in sockets. Many of these appear twice in life.
  • They breathe through lungs and have a four-chambered heart.
  • They are warm-blooded and their body cavity is divided into a thorax and an abdomen by a muscular diaphragm.
  • Mammalian red blood cells are non-nucleated.
  • Fertilization in mammals is internal. The embryo develops in the uterus. And when the young ones, are born, they feed on milk from the mother’s mammary glands.
  • Example: Some like the platypus and echidna lay eggs, while some like the kangaroo give birth to poorly developed young ones. Mammals are broadly grouped into six groups based on their feeding habits and locomotion.

    The representative animals of these groups are: (a) platypus, (b) kangaroo, (c) man, (d) whale, (e) rat, and (f) elephant.

                                              

     

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

    Most of the mammals are _________________

    Right Option : B
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    Explanation
    Question : 2

    Which of the following is commonly known as cuttlefish ?

    Right Option : B
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    Explanation
    Question : 3

    Presence of Mammary gland is the characteristic feature of ____________________ organism .

    Right Option : A
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    Explanation
     
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