Make a cell theory timeline 1590-1900: with CELL THEORY HISTORICAL TIMELINE ACTIVITY
List a few of the contributions the following people have made to science
List the Dates of the contributions these people have made to the Cell Theory.
1. Robert Hooke:
2. Hans & Zacharias Janssen:
3. Anton van Leeuwenhoek:
4. Matthias Schleiden:
5. Theodor Schwann
6. Rudolph Virchow:
***Create a Timeline showing the chronological order of these scientists and their contributions. Write down the information FIRST, then create the timeline. ***
ALL 6 INVENTORS ARE ON THE TIMELINE
Label the timeline with dates of the above Scientists discoveries (on the inventor card)
The earliest date should be on the left of the timeline and the most recent date should be on the right
Label each date with corresponding scientist's name & a brief description of their contribution(s) in an organized and legible manner. Draw an illustration to represent their contribution to the Cell Theory.
Be sure your spacing shows a reasonable approximation of the amount of time that elapsed between dates
Questions to Answer
1: What theory did these scientists provide evidence for?
2: What instrument was necessary before the cell theory could be developed?
3: Which 3 scientists directly contributed evidence for the cell theory?
4: How did the earlier scientists and their contributions directly affect the discoveries of later scientists (see #2)? For example, what had to come first?
1. Robert Hooke:
- Contribution to science: Discovered and named cells.
- Date of contribution: 1665.
2. Hans & Zacharias Janssen:
- Contribution to science: Invented the compound microscope.
- Date of contribution: Around 1590.
3. Anton van Leeuwenhoek:
- Contribution to science: Developed a more powerful microscope and observed microorganisms, including bacteria and sperm cells.
- Date of contribution: Late 17th century.
4. Matthias Schleiden:
- Contribution to science: Proposed that plants are composed of cells.
- Date of contribution: 1838.
5. Theodor Schwann:
- Contribution to science: Proposed that animals are composed of cells.
- Date of contribution: 1839.
6. Rudolph Virchow:
- Contribution to science: Stated that all cells come from pre-existing cells through cell division.
- Date of contribution: 1855.
Timeline:
1590 - Hans & Zacharias Janssen invent the compound microscope.
1665 - Robert Hooke discovers and names cells.
Late 17th century - Anton van Leeuwenhoek observes microorganisms using a powerful microscope.
1838 - Matthias Schleiden proposes that plants are made up of cells.
1839 - Theodor Schwann proposes that animals are made up of cells.
1855 - Rudolph Virchow states that all cells come from pre-existing cells through cell division.
Answers to the questions:
1. These scientists provided evidence for the cell theory.
2. The compound microscope was necessary before the cell theory could be developed.
3. The three scientists who directly contributed evidence for the cell theory are Matthias Schleiden, Theodor Schwann, and Rudolph Virchow.
4. The earlier scientists and their contributions directly affected the discoveries of later scientists. The invention of the compound microscope by the Janssens allowed for the observation of cells by Robert Hooke. Anton van Leeuwenhoek's improvement of the microscope led to his discoveries of microorganisms. Schleiden and Schwann then proposed that plants and animals are composed of cells, respectively. Finally, Virchow's statement about cell division further reinforced the idea that cells come from pre-existing cells. Therefore, the discoveries of each scientist built upon the previous ones, contributing to the development of the cell theory.
1. Robert Hooke:
- Contribution: In 1665, Robert Hooke observed cork cells under a microscope and coined the term "cells" after their resemblance to the cells of a monastery.
- Timeline: 1665
2. Hans & Zacharias Janssen:
- Contribution: Although the exact date is unknown, in the late 16th century, the Janssen brothers invented the compound microscope, which allowed for higher magnification of samples.
- Timeline: Late 16th century
3. Anton van Leeuwenhoek:
- Contribution: In the late 1670s and early 1680s, Anton van Leeuwenhoek developed a single-lens microscope and used it to observe and describe various microorganisms, including bacteria and protozoa.
- Timeline: Late 1670s - Early 1680s
4. Matthias Schleiden:
- Contribution: In 1838, Matthias Schleiden proposed that all plants are composed of cells, thus highlighting the presence of cells in plant tissues.
- Timeline: 1838
5. Theodor Schwann:
- Contribution: In 1839, Theodor Schwann extended the cell theory to animals by stating that all animals are also made up of cells, just like plants.
- Timeline: 1839
6. Rudolph Virchow:
- Contribution: In 1855, Rudolph Virchow added to the cell theory by proposing that cells can only arise from pre-existing cells, contradicting the idea of spontaneous generation.
- Timeline: 1855
Timeline:
- Late 16th century: Hans & Zacharias Janssen (Invention of compound microscope)
- 1665: Robert Hooke (Observation of cork cells)
- Late 1670s - Early 1680s: Anton van Leeuwenhoek (Observation of microorganisms)
- 1838: Matthias Schleiden (Recognition of cells in plants)
- 1839: Theodor Schwann (Extension of cell theory to animals)
- 1855: Rudolph Virchow (Principle of cell division)
Questions to Answer:
1. What theory did these scientists provide evidence for?
These scientists provided evidence for the Cell Theory.
2. What instrument was necessary before the cell theory could be developed?
The compound microscope was necessary before the cell theory could be developed.
3. Which 3 scientists directly contributed evidence for the cell theory?
Anton van Leeuwenhoek, Matthias Schleiden, and Theodor Schwann directly contributed evidence for the cell theory.
4. How did the earlier scientists and their contributions directly affect the discoveries of later scientists (see #2)? For example, what had to come first?
The invention of the compound microscope by Hans & Zacharias Janssen laid the foundation for the observations made by Robert Hooke, Anton van Leeuwenhoek, and the subsequent scientists. Without the microscope, these scientists would not have been able to observe and describe cells, leading to the development of the cell theory. Therefore, the invention of the microscope had to come first.