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 3 Structure of cells  Let’s see the following videos to study the structure of animal cells and plant cells. To study the animal cells we will observe cheek cells and for the plant cells, let's take onion epidermal cells, as these cells are easily obtained.
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 1.Basic unit of life  In 1665, Robert Hooke observed a section of a cork using a microscope prepared by him. He discovered a structure like chambers in a beehive and he named them as cells. Schleiden, Schwann and Radolf Virchow introduced the cell theory, based on the facts revealed by observing different live tissues through the microscope. The contents of the cell theory are as follows.  The structural and functional unit of life is the cell.  All organisms are made up of one or more cells.  New cells are formed from pre-existing cells.
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 Study of plant cells (onion peel cells)                                                    Materials Required - Onion peel, Watch glass, Glass slide, Cover slip, Paint brush, Microscope, Water Method Cut an onion and obtain an inner fleshy tissue as shown in the diagram. Remove a peel from inner or outer surface of it and transfer it on to a watch glass containing water. Put a water drop on to a clean glass slide and transfer the specimen on to the slide using a paint brush. Cover it with a cover slip without trapping any air bubbles and observe it through the microscope.
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