NEET Biology Chapter 8

Cell : The Unit of Life

When you look around you see both living and non living things. You must have wondered and ask yourself "what is it makes an organism living, or what is that an inanimate things does not have which a living things has? The answer to this is the presence of the basic unit of life the cell in all living organisms.

All organisms are composed of cells, Some are composed of a single cell and are called unicellular organisms while others, like us, composed of many cells, are called multicellular organisms.

Unicellular organisms are capable of (i) independent existence and (ii) performing the essential functions of life. Anything less than a complete 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 its improvement leading to the electron microscope revealed all the structural details of the cell.

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