The document discusses the cell, the fundamental unit of life. It outlines that Robert Hooke first observed dead cells in tree bark in 1665. Anton van Leeuwenhoek then observed living cells in pond water in 1674. The cell theory, formulated by Schleiden, Schwann and expanded by Virchow states that all living things are made of one or more cells, the cell is the basic functional unit of life, and new cells are produced from existing cells.

1. CELLS
Presented by : Vivek Sharma

2. CELL
• Cell is the Fundamental – Structural &
Functional unit of life.

3. Discovery Of Cell
• Robert Hooke (1665) : Observed Dead cells in
a bark of a tree.
• Anton Van Leeuwenhoek (1674) : Living cells
in Pond water
• Robert Brown (1831) : Discovered Nucleus.
• Purkinje (1839) : Protoplasm

4. CELL Theory
• Formulated By M.J. Schleiden (1838) and
T.Schwann (1839)
• Expanded by Virchow (1855)
Cell Theory States that
• Living things are made up of One or more
Cells
• The Cell is the Structural & Functional unit of
Life
• Cells come from pre-existing Cell

5. Basic Structure of Cell