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UNIT 3 - NCERT

UNIT 3 Biology is the study of living organisms. The detailed description oftheir form and appearance only brought out their diversity. It is thecell theory that emphasised the unity underlying this diversity of forms, , the cellular organisation of all life forms. A description of cellstructure and cell growth by division is given in the chapters comprisingthis unit. Cell theory also created a sense of mystery around livingphenomena, , physiological and behavioural processes. This mysterywas the requirement of integrity of cellular organisation for livingphenomena to be demonstrated or observed.

structure of a cell does not ensure independent living. Hence, cell is the fundamental structural and functional unit of all living organisms. Anton Von Leeuwenhoek first saw and described a live cell. Robert Brown later discovered the nucleus. The invention of the microscope and

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