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  5. The Fundamental Unit of Life

9th Class Science The Fundamental Unit of Life Question Bank MCQs - The Fundamental Unit of Life

  • question_answer
    Cell theory states that cells are structural and functional unit of

    A) plants              

    B) animals

    C) Both [a] and [b] 

    D) microbes

    Correct Answer: C

    Solution :

    [c] Schleiden and Schwann gave the cell theory, which was further refined by Rudolf Virchow (1855). The main postulates of cell theory are
    (i) All plants and animals are composed of cells and cell products.
    (ii) All metabolic reactions take place in cells. Thus, cell are structural and functional units of life.
    (iii) All cell arise from pre-existing cells only. No cell can originate spontaneously, but they comes into being only by division of pre-existing cells.
    (iv) Every organism starts its life as a single cell.


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