1. How did Janssen's, Hooke's, and LeeWenhoek's contribute to the work of the scientists that came after them?
It all begins with Janssen's invention of the microscope which allowed scientist Hooke to use the microscope which allowed scientists Hooke to use the microscope to view the cell walls of a piece of cork. In 1665, Hooke discovered about cells. Later on, Leewenhoek discovered the first bacteria. 3. Describe the concept of spontaneous generation. Why do you it took such a long time for people to accept that this idea was incorrect? In the biology world, all experiments are improved and “completed” after they’re finished. Idealy, you would be able to no see any fails. The idea of spontaneous generation that states if living organisms can originate from non living organisms/ matter is one of the wrong case. This theory was made by aristotle. The spontaneous generation is generally and widely accepted (until the 18th century) until it was disproven in the 19th century by Louis Paster. 5. The microscope and numerous experiments lead to the rejection of spontaneous generation. This idea has been accepted by most people, including scientists, for over 200 years. How does this demonstrate the true nature of science? It is a common knowledge that the nature of science is constantly changing. As researching and developing ideas takes time and places, scientist keeps on following their curiosity and develop investigations in order to gather evidence. Once the evidence is gathered, it is made to an hypothesis, explanation and theories. This is why the spontaneous generation theory become more questionable. Through studies and experiments (like Hooke's and Pasteur's experiment), people were introduced to new ideas (including the cell theory) until the theory was disapproved. This shows that the true nature of science is constantly changing. 7. Examine your timeline. How long did it take to develop the cell theory? What does this imply about the formulation of a theory? The cell theory took over almost 200 years to develop, after the first microscope was created, since then the cell theory information and experiments has developed. The first evolution in the cell theory was in 1665, at that time Robert Hooke discovered a honeycomb(cell) structure through a microscope at a cork. What he saw when he looked in the microscope was a cell. He chose the word "cell" to describe what he saw. Through out the years, many other scientists contribute to the cell theory. One of them is Schwan, a German botanist made the conclusion that not only plants tissue but animals are also composed of cells which ended the debate that plants and animals has different structure. He also made a theory that states if checks are organisms and organisms are made up of 2 or more cells and that cells are the basic unit of structure for all organisms. The final 3rd part of the cell theory was finished by Virchow in 1995. The 3rd states that all cells come from existing cells. Vichrow was also the first to propose that diseased cells come from healthy cells. |
2. How would our lives be different if we had never realized the existance of microorganisms?
Since we know the existance of microorganisms, microorganisms itself plays a role and do so many beneficial things (the foundation for all medical and scientific research) and we wouldn’t probably would live without them. One of the most common benefit of microorganism is that they helps us digest food,therefore,our lives would be different if we never realized the existance of microorganisms. So without microorganisms: - we could not be able to enjoy ceritain food such as cheese, youghourt, and etc - we could never be able to make vaccine for certain treatments - we would never keep our environment clean - we would never be hygiene properly - higher chance of getting sick 4. How do you think the cell theory impacted later scientific discoveries? As we all know, we believed that a cell is the basic building blocks of all organisms. Which makes the cell theory the basis for any and all biological science. Today, the discovery of cell theory has impacted a lot of modern science. It impacted the modern science as many different hypothesis, scientific discoveries and research were concluded with the help of the basics In the theory. For example: cell division, genetics, inheritance, anatomy, structure, and etc. 6. Review Pasteur's experiment. Relate his experiment to the scientific method. A. What was Pasteur's question? He wanted to know if living organism, such as germs, could be generated from non-living matters (the sterile nutrient broth). B. State a reasonable hypothesis based upon this question. A living organism can't be generated from non living matter because a living organism must react with another living organism in order to recreate a new cell. C. What was the independent variable in Pasteur's experiment? What was the dependent variable? The independent variable is the flask design (one having a straight neck and one having the "S" shape neck) since the growth of microbes depends on the flask design. Which makes the microbes the dependent variable. As the flask design will give an impact/ affect to the growth of the microbes. It is proven based on the experiment as you may noticed if there are more curves in the flask, less air will enter, preventing them from reaching the broth and eventually it will trap the germs in the curved neck. D. What did Pasteur conclude from his experiment? From his experiment, Pasteur concluded that there is no such thing as spontaneous generation. If spontaneous generation is proven/real, the broth in the curved neck flask would be reinfected because the microbes would be generated. 8. Why do we still consider the cell theory a theory? A scientific theory is an idea/explanation on how things happen and why things work. Scientists develop theories based on the observation of the world around them and it is later proofed based on experiments/tests. From the experiment/test, the theory may be proven wether it's correct/ incorrect and that's why it still can be changed, that's why the cell theory is still considered a theory because the idea can still be changed/evolved as more discoveries are made. |
osmosis_in_potatoes_lab_report.pdf | |
File Size: | 534 kb |
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Fibrous Root System: A fibrous root system is created by a thick network of thin and stringy roots that all have aboout the same diameter. They don't have a primary root. They grow both, downward and upward with repeating branches.
(This thin and stringy roots is still little because it was still a small plant so they haven't grow as much) |
Tap Root System: A tap root system is a root where the main root grows down vertically, and from which many smaller roots grows. The main root is called taproot and the roots that branches off from the main root is called lateral root.
(This picture is taken from the internet because my plant was too big and so i cant take it out) |
Vocabularies
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Important Notes from Cosmos
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