TEKS 7.12F: Recognize that according to cell theory all organisms are composed of cells and cells carryon similar functions such as extracting energy from food to sustain life.Purpose: To learn about the scientists who contributed to the development of theCell Theory and to the rejection of spontaneous generation.TASK: You will use internet resources to create a timeline that begins with theinvention of the compound microscope to the experiment that finally dispelled theoutdated idea of spontaneous generation. After completing your timeline, you shouldsummarize the three parts of the cell theory in your own words. The Scientists (Include pictures in your timeline) 1) Zacharias Jansen 2) Anton van Leeuwenhoek 3) Robert Hooke 4) Matthias Schleiden
5) Theodor Schwann 6) Rudolf Virchow7) Louis PasteurResearch the following questions about each scientist and include thisinformation in your timeline. * How did this scientist contribute to the cell theory? (Make sure the information that you provide here is related to the cell theory.) * When did this scientist make his contribution to the cell theory? * How did this scientists invention, idea, or experiment help lead to the rejection of spontaneous generation?
Descriptions of ScientistsRobert Hooke 1965 Anton von Leeuwenhoek Theodore SchwannAll living creatures are made up of 1674 German physiologist, generallycells. Discovered this when Van Leeuwenhoek is credited considered the founder oflooking at some cork bark under a with having invented the modern histology, the study of microscope in the 17th century. the structure of plant andmicroscope and saw what looked He was able to see animal tissues.like a series of tiny rooms, orcells. microscopic organisms and drew them.Matthias Schleiden 1838 Rudolf Virchow Zacharias Jansena German botanist, concluded All life on the planet is made up of Zacharias Janssen isthat all plant tissues are cells. This theory was the generally believed to be thecomposed of cells and that an backbone for the cell theory weembryonic plant arose from a first investigator to invent the know today compound microscope.single cell.Louis Pasteurspontaneous generation ofmicroscopic animals.Pasteur boiledsome broth to kill any microbespresent. With special glassware, heallowed air to circulate over the broth,but prevented microbes in the airfrom reaching the broth. As Pasteurexpected, no microbes appeared inthe broth. Pasteur’s findings showedthat microbes were not spontaneouslygenerated from the broth itself.
Sample Rubric Beginning Developing Accomplished Exemplary Score 1 2 3 4 Accuracy Information Information Information Information shows no contains contains minor is accurate research on multiple inaccuracies and the part of inaccuracies and/or is missing complete. It the student and/or is some is written in and/or many missing a information, a clear and items are substantial and/or is concise incomplete amount of somewhat wordy fashion. and/or information or unclear. information and/or is very was copied wordy. and pasted from sources. Creativity Creativity is Some effort Assignment is Assignment completely to be creative. colorful and is original, lacking. No Color and includes images colorful, and color or images may yet it is lacking includes images not be innovation. images. used. relevant to Student went assignment. above and beyond the parameters of the assignment.
Grammar There is no Multiple Few No evidence of grammatical grammatical grammatical appropriate errors are errors are errors are grammar in present but detected. detected the text still assignment. shows some effort on the part of the student.