Class :-9
The Fundamental Unit of Life :-Class 9 Notes
Cell – The Basic Unit of Life
The cell is the structural and functional unit of all living organisms.
Discovered by Robert Hooke in 1665 (observed cork cells).
Leeuwenhoek observed living cells.
Schleiden and Schwann proposed the cell theory, which was further expanded by Rudolf
Virchow (1855) stating that all cells arise from pre-existing cells.
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Types of Cells
1. Prokaryotic Cells
No well-defined nucleus (DNA in nucleoid).
No membrane-bound organelles.
The Fundamental Unit of Life :-Class 9 Notes
Cell – The Basic Unit of Life
The cell is the structural and functional unit of all living organisms.
Discovered by Robert Hooke in 1665 (observed cork cells).
Leeuwenhoek observed living cells.
Schleiden and Schwann proposed the cell theory, which was further expanded by Rudolf
Virchow (1855) stating that all cells arise from pre-existing cells.
---
Types of Cells
1. Prokaryotic Cells
No well-defined nucleus (DNA in nucleoid).
No membrane-bound organelles.
