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Describe the process of photosynthesis essay
Describe the process of photosynthesis essay
Project on paper chromatography
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The Analysis of Spinach Pigmentation
During Photosynthesis
University of Alabama
I. Introduction:
"Photosynthesis is the conversion of light energy to chemical energy that is stored in glucose or other organic compounds; it occurs in plants, algae, and certain prokaryotes" (Campbell, G-16). The formula below is photosynthesis and "the ingredients necessary to make a plant grow" (KoK, 30).
6CO_2 + 6H_2_0,,³ C_6_H_12_O_6_ + 6CO_2
Photosynthesis occurs within chloroplasts which are in leaf cells. It takes carbon dioxide and water "within the chloroplast, sunlight powers the conversion of these ingredients to a sugar called glucose and oxygen" (Campbell, 37).
Pigments are substance that absorbs visible light. It depends on pigment of which wavelength of light is absorbed. The wavelength that reflects makes them appear to be colorful. Pigments are useful to plants because of the interaction with light to absorb certain wavelengths.
During the lab, the analysis of spinach pigmentation during photosynthesis was performed to separate plant pigments with paper chromatography. The paper chromatography two phases are: stationary phase and the mobile phase. The paper serves as the absorbent for the stationary phase and acetone is used for the mobile phase to help pull the pigments up the page.
Once the analysis of spinach pigmentation during photosynthesis was finished, the percent absorption was measured at different nanometers to see compare the difference in absorption of chlorophyll A and total pigmentation.
The hypothesis stated that when the spinach extract was placed on the polar paper chromatography the pigment would separate into different pigments on the...
... middle of paper ...
.... Since chlorophyll A was only one pigment of the spinach extract it was able to absorb on the certain wavelength at high percentages. The human error in this part of the lab was the touching and wiping of the test tubes. A simple smudge of a fingerprint not wiped completely off could have altered the data.
The experiment based on what was discussed before the lab and during the lab does follow the norm. The basic idea was to get the spinach extract to absorb up the paper and then test its percent absorption.
Works Cited
Carter, M., Morgan, J. Investigating Biology: Fourth Edition.
Pearson Custom Publishing, San Francisco: 2002.
Campbell, Neil A. Biology: Fourth Edition. Benjamin/Cummings
Publishing, New York: 1996.
KoK, Bessel. 1967. Photosynthesis-Physical Aspects. Harvesting the Sun:
Photosynthesis in Plant Life: 30.
To test for this, DCIP (a chloroplast isolation buffer) was used to The hypothesis for this experiment was that the cell fraction in the cuvette marked P2 will have more chloroplast activity because it will exhibit greater color change and differences in the absorbance readings compared to the other cuvettes when exposed under the condition of light; moreover, this notion was believed to be so because the more a cell fraction is centrifuged, the more intact chloroplasts we’ll find (Leicht and McAllister, This meant that this cuvette (tested under light) should display a higher decrease in DCIP due to the reduction in absorbance (dependent variable) opposed to the other cell fractions tested depending on a sixteen minute period (independent variable). The overall goal was to provide proof, through data, that the cell fractions put under the light during the sixteen minute period would indicate a higher set of chloroplast activity versus the ones put in the
Photosynthesis consists of the following equation: Sun light Carbon dioxide + Water = = == == ==> Glucose + Oxygen Chlorophyll Chlorophyll is a substance found in chloroplasts, found in the cells of leaves.
PURPOSE: The purpose of the experiment is to determine the specific types of pigments found in water-soluble marker pens by using paper chromatography and water as a solvent.
This chemical is used to catch the light energy needed in photosynthesis. They take carbon dioxide from the air. Plants use sunlight to turn water and carbon dioxide into glucose. Plants use glucose as food for energy and as a building block for growing. The way plants turn water and carbon dioxide into sugar is called photosynthesis.
Experiment #3: The purpose of this experiment to test the chromatography of plant pigments the alcohol test strip test will be used.
When I dropped iodine to the leaf where I split off from the plant which had waited in red light, its color changed into blue. However, when I dropped iodine to the leaf where I split off from the plant which had waited in green light, its color stayed the same. It is because the plant waited in red light could make more photosynthesis than the other one, so it has more glucose and an iodine solution makes substance’s color blue if it has starch. It is used to test the presence of starch.
= = = [IMAGE][IMAGE]6CO2 + 6h20 light energy and chlorophyll C6H1206 + 6O2 Carbon dioxide + water converted into glucose and oxygen. Theory of photosynthesis Photosynthesis is a chemical reaction, which uses the energy from sunlight to convert carbon dioxide and water to oxygen.
[IMAGE]Carbon dioxide + water Light Energy glucose + oxygen Chlorophyll [IMAGE]6CO2 + 6H20 Light Energy C6 H12 O6 + 6O 2 Chlorophyll Photosynthesis occurs in the leaves of the plant in the palisade layer. Chlorophyll in the cells in the palisade layer absorb light for photosynthesis. The plant releases the oxygen created in photosynthesis back into the air but it uses or stores the glucose for energy, respiration, growth and repair. The leaves and plants are also specially adapted for photosynthesis in their structure and cell alignment. Preliminary Experiment Apparatus * Piece of Elodea Canadensis * Bulb * Voltmeter * Test tube * Beaker * Box *
... Carotenoids absorb mostly blue wavelengths which allow the longer to disperse and create the color yellow on the leaves. Much like carotenoids, anthocyanins, which give leaves a red pigment, absorb blue-green wavelengths. This allows the red wavelengths to disband and makes the red visible to the human eye. (http://harvardforest.fas.harvard.edu)
They are accessory pigment molecules that cascade light energy to primary pigments. Carotenoids absorb wavelengths in the blue and green region of the visible spectrum (400-550nm) and reflect wavelengths of 590-650nm so appear red-orange in colour. They are found in all plants and some photosynthetic bacteria. Carotenoids are separated into two groups, carotenes and xanthophylls. Carotenes (C40H56) are polyunsaturated hydrocarbons containing no oxygen and include pigments such as α-carotene, β-carotene, and lycopene. They give the orange colour to carrots and autumn leaves. Xanthophylls (C40H56O2) contain oxygen and include lutein and zeaxanthin. Carotenoids contain alternating carbon-carbon double bonds and single bonds, forming a conjugation system where electrons in the fourth outer shell are in p-orbitals which overlap. This overlapping produces a system of π-bonds with delocalised electrons. The delocalised electrons are free to move so are more easily lost because less energy is needed to raise them to an excited state. Shorter wavelengths towards the blue end of the spectrum with lower energies are absorbed because of the lower energy
Photosynthesis is a process in plants that converts light energy into chemical energy, which is stored in bonds of sugar. The process occurs in the chloroplasts, using chlorophyll. Photosynthesis takes place in green leaves. Glucose is made from the raw materials, carbon dioxide, water, light energy and oxygen is given off as a waste product. In these light-dependent reactions, energy is used to split electrons from suitable substances such as water, producing oxygen. In plants, sugars are produced by a later sequence of light-independent reactions called th...
Photosynthesis is a process in which plants and other organisms convert the light energy from the sun or any other source into chemical energy that can be released to fuel an organism’s activities. During this reaction, carbon dioxide and water are converted into glucose and oxygen. This process takes place in leaf cells which contain chloroplasts and the reaction requires light energy from the sun, which is absorbed by a green substance called chlorophyll. The plants absorb the water through their roots from the earth and carbon dioxide through their leaves.
In plants, proteins called photosynthetic reaction centers contain green chlorophyll that absorbs light energy. These proteins are held inside organelles called chloroplasts, which is abundant in leaf cells. In contrast, bacteria house the proteins in the plasma membrane. Chloroplasts are found in the cells of green plants and photosynthetic algae where photosynthesis takes place. Inside the chloroplast are folded structures in disk-shaped arrangement called thylakoids, which enclose chlorophyll in their membrane. Only certain portions of the light spectrum can be absorbed and the photosynthetic action spectrum is dependent on the type of accessory pigment present. Green plants mostly absorb red and blue wavelengths because the action spectrum corresponds to absorption spectrum for chlorophylls and carotenoids. The color of the pigment comes from the wavelengths of light reflected. Plants appear green because they reflect yellow and green wavelengths of light. Photosynthesis involves two series of chemical events, called the light independent that occurs in the stroma and light dependent reactions that occurs in the lumen. They are also known as light and dark reactions this terminology is somewhat ambiguous, because the entire process of photosynthesis is regulated to take place when an organism absorbs visible light. Organized clusters of chlorophyll and beta-carotene in the thylakoid membrane are present to
According to scientists, photosynthesis is “the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.” ("pho•to•syn•the•sis,")
An Experiment to Investigate the Effect of Light Intensity on the Rate of Photosynthesis. Introduction Photosynthetics take place in the chloroplasts of green plant cells. It can produce simple sugars using carbon dioxide and water causing the release of sugar and oxygen. The chemical equation of photosynthesis is: [ IMAGE ] 6CO 2 + 6H20 C 6 H12 O 6 + 6O2 It has been proven many times that plants need light to be able to photosynthesize, so you can say that without light the plant would neither photosynthesize nor survive.