4. History
• The study of cells started about three hundred
years ago.
• With the help of one powerful instrument the
cell was begin to be known to humans.
5. Cell Discovery
• The scientist who have contributed to the
discovery of the cell:
Hans and Zacharias Jansen
Robert Hooke
Matthias Schleiden
Theodor Schwann
Robert Brown
13. 1674
• Anton van Leeuwenhoek
Dutch Businessman.
Described cells in a drop of pond water that he
called “animalcules”.
“Father of Ancient
Microbiology”
16. 1838
• Matthias Jakob
Schleiden
German
botanist, conclud
ed the all plant
tissues are
composed of
cells.
17. 1839
• Theodor Schwann
German zoologist,
concluded that all
animal tissues are
composed of
cells.
Proposed the cell
theory
18. 1858
• Rudolph Virchow
Completed the cell theory by expounding
his famous conclusion “omnis cellula e
cellula” or cells develop from pre-
existing cells.
19. Cell Theory According to Schwann
1) The cell is the unit of structure,
physiology, and organization in living
things.
2) The cell retains a dual existence as
a distinct entity and a building block
in the construction of organisms.
20. Continued…
3) Cells form by free-cell formation,
similar to the formation of crystals
(spontaneous generation).
24. Revised Cell Theory
1. all known living things are made up of cells.
2. the cell is structural & functional unit of all living
things.
3. all cells come from pre-existing cells by division.
(Spontaneous Generation does not occur).
27. Multiple Choice
Direction: Write the CAPITAL LETTER of
the correct answer on your paper.
1. What is the structural and functional
unit of all living organism?
A. Tissue
B. Cell
C. Organ
D. Organ System
28. 2. Who was the German Physiologist who
completed the Cell Theory?
A. Theodor Schwann
B. Matthias Schleiden
C. Rudolph Virchow
D. Robert Hooke
29. 3. Who was the German Botanist who
stated that all plants are made up cells?
A. Theodor Schwann
B. Matthias Schleiden
C. Anton van Leeuwenhoek
D. Robert Brown
30. 4. Who discovered the nucleus of the
cell?
A. Robert Hooke
B. Robert Brown
C. Rudolph Virchow
D. Hans and Zacharias Jansen
31. 5. He falsified the spontaneous
generation
A. Theodor Schwann
B. Francesco Redi
C. Anton van Leeuwenhoek
D. Robert Hooke
32. 6. He used his simple microscope in
observing cells from a drop of pond
water that he called “animalcules”
A. Hans and Zacharias Jansen
B. Theodor Schwann
C. Anton van Leeuwenhoek
D. Rudolph Virchow
33. 7. He is a German Zoologist who stated
that all animals are composed of cells
A. Matthias Schleiden
B. Theodor Schwann
C. Robert Brown
D. Robert Hooke
36. 1. What is the structural and functional
unit of all living organism?
A. Tissue
B
B. Cell
C. Organ
D. Organ System
37. 2. Who was the German Physiologist who
completed the Cell Theory?
A. Theodor Schwann
C
B. Matthias Schleiden
C. Rudolph Virchow
D. Robert Hooke
38. 3. Who was the German Botanist who
stated that all plants are made up cells?
A. Theodor Schwann
B
B. Matthias Schleiden
C. Anton van Leeuwenhoek
D. Robert Brown
39. 4. Who discovered the nucleus of the
cell?
B
A. Robert Hooke
B. Robert Brown
C. Rudolph Virchow
D. Hans and Zacharias Jansen
40. 5. They/He first constructed a compound
microscope
A. Theodor Schwann
B
B. Hans and Zacharias
C. Anton van Leeuwenhoek
D. Robert Hooke
41. 6. He used his simple microscope in
observing cells from a drop of pond
water that he called “animalcules”
A. Hans and Zacharias Jansen
B. Theodor Schwann
C. Anton van Leeuwenhoek C
D. Rudolph Virchow
42. 7. He is a German Zoologist who stated
that all animals are composed of cells
A. Matthias Schleiden
B
B. Theodor Schwann
C. Robert Brown
D. Robert Hooke
43. • 8-10 State the Cell Theory
8. all known living things are made up of
cells.
9. the cell is structural & functional unit
of all living things.
10. all cells come from pre-existing cells
by division.
