UNIT OF LIFE : CELL - and functional unit of life. CELL DISCOVERY –...

THE FUNDAMENTAL

UNIT OF LIFE : CELL

Cell- It is the fundamental , structural and functional unit of life.

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CELL DISCOVERY –

• Cell was firstly discovered by Robert hooke in

1665 and that was a dead cell taken from a cork tissue of bark of an oak tree and further observed by him through his self designed microscope.

• A living cell was discovered by Antonie van

leewenhooke in bacteria , protozoa ( pond) in 1674.

• Robert Brown discovered nucleus in 1831.
• Purkinge coined the term protoplasm.

CELL THEORY— Schledein ( botanist ) said, all plants are made up of cells in 1838.

Theodore Schwann ( zoologist) said , all animals are made up of cells in 1839.Rudolf Virchow extended the cell theory by declaring one statement “OMNIS -E CELLULA E CELLULA” which meant that new cells arise from pre existing cells in 1855.

*Cells can be of any shape.*

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