Cell


 
 
Concept Explanation
 

Cell

Cell: there is large variety of living organisms around us. Each organism starts its life as a single cell. Cells have many functions which keep an organism alive. The cells is the basic structural and functional unit of all living organisms. It is the smallest unit of life and thus it is known as building blocks or basic structural unit of life. As the blocks can be joined in many ways to make the building of different shapes and sizes. In the same way all , living organisms are made differently of different shapes, sizes and by different number of cells.

  • Cells take in nutrients, convert them into energy, carry out specialized functions and then reproduce as necessary.
  • Microscope: an instrument used to see cells. Simple microscope helps to see small things but not microscopic objects. As cells are microscopic structures, are only visible under a powerful microscope like a compound microscope.
  • Cell can also be defined as 'a mass of protoplasm bounded by a plasma membrane'.
  • The life span of different cells of the body very differently as shown in the table.                       
  •    Cell type Life  span
      Red blood cells    less than 120 days
      White blood cells     13 to 20 days
      Liver cell    200 to 300 days
      Skin epidermal cells     2 to 4 weeks
       Cardiac cell     Long lived
       Nerve cell      Long lived
       Epithelia of small intestine    1 week or less

     

     

     

     

     

     

     

    The branch of science that deals with the study of cell is called as cytology.

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

    The history of cell began in 1665 with the publication of Micrographia in London by the scientist _________________.

    Right Option : A
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    Explanation
    Question : 2

    Temporary mount of a tissue is made in ______________________.

    Right Option : C
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    Explanation
    Question : 3

    The idea 'omnis cellula e cellula' which means that all living cells arise from pre-existing cells was given by ______________.

    Right Option : C
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    Explanation
     
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