91 Exercise 1 – Observing Photosynthesis via CO 2 Consumption 1. “Wavelengths Of Light That Are Most Effective For Photosynthesis”. You will measure the rate of photosynthesis by counting the number of oxygen bubbles that … This allows the students to focus on only one process -- either photosynthesis or respiration. Third, take the syringe, remove its plunger, and place one of the sets of leaf discs (12 discs) in the syringe. “Wavelengths Of Light And Photosynthetic Pigments (Article) | Khan Academy”. Photosynthesis is the synthesis of complex organic materials and light energy to convert into chemical energy. Elodea & PhotosynthesisPhotosynthesis is the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Save. It is critical to avoid soap suds to form in this step. Science Life Science Look at my data below and answer the following question. With these three ingredients, photosynthesis occurs, releasing oxygen as a waste product and creating the glucose needed by the plant to feed itself. My hypothesis was partially correct. Students can measure the rate over time. There are various set-ups that can be used to measure the rate of photosynthesis, each relies on counting the oxygen produced during the reaction. Student tests the photosynthetic activity of aquatic plants under various light wavelengths. A common experiment when studying plant biology is investigating factors affecting the rate of photosynthesis. Elodea+Photosynthesis+Lab.docx - Elodea Photosynthesis Lab Jaxson B Ethan S Bio 20 Problem Pt.A How does the distance between the light source and plant. We will be calculating the averages of the time it has taken the plant discs to float up to the surface per minute in both of the trials for every light frequency. We can see that in the graph representing the data table’s results that the most amount of plant discs have floated to the surface of the solution in the least amount of time was the plant discs in the solution under the red light. Elodea Photosynthesis Lab. Make sure none of the glass material is in danger of falling. “What Are The Best Light Sources For Photosynthesis? Demonstrate that environmental CO2 is used during photosynthesis in Elodea. – Vernier”. We will need to keep a consistent temperature in the water in which the bicarbonate and soap solution is made in for this experiment because according to Samuel Markings on sciencing.com, photosynthesis occurs at different rates depending on the temperature [2] a plant is exposed to, similar to keeping the room temperature consistent. This lab will evaluate the optimal wavelengths and degrees of intensity during … For example, if we take the 7th minute of plant discs under a red light of 430-480 THz, we will need to find out the sum of its terms. But how can we measure oxygen or carbon dioxide levels? It is a chemical reaction that involves the use of carbon dioxide, water, and light. The rate of photosynthesis is determined by the number of bubbles formed by the Elodea plants. If these plant discs are placed under a light source, it is inevitable that they will eventually float up due to their need to go through the process of photosynthesis. If water is used for other trials of experiment differs to previous temperatures, find a way to heat or cool it. Try to avoid the midrib and veins when cutting out the discs. (Richmond Public School). To improve results, add a pinch of baking soda to the water in the test tube. If we change either of these temperatures during our experiment, the plant discs may react in ways that they wouldn’t have if everything had stayed the same – meaning inaccurate results. Your online site for school work help and homework help. I can also see that, in the data tables, there are major differences between the results recorded for the first and seconds trials. Elodea Lab - Displaying top 8 worksheets found for this concept.. Obtain 3 pieces of Elodea about 6 cm in length and 2 pieces of aluminum foil. Part 1: Measurement of Photosynthesis. Sciencing, 2020, https://sciencing.com/what-color-of-light-do-plants-absorb-13428149.html. Originally from Brazil, E. densa has spread to temperate regions on all of the continents except Antarctica. Professional writers in all subject areas are available and will meet your assignment deadline. Tutor and Freelance Writer. Science Teacher and Lover of Essays. Put the plunger back in the syringe, leaving a small space above the leaf discs as to not squish them (a space of <10%). 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ATTENTION: Please help us feed and educate children by uploading your old homework! My hypothesis is that if a light source of 100 watts above the plant discs is changed to the different frequencies of Red Light (430–480 THz), Blue Light (610–670 THz), Yellow Light (510–540 THz), Green Light (540–580THz), and Clear Light, the number of leaf discs out of 12 floating in the bicarbonate solution over time will differ. The rate of photosynthesis will be measured by the number of bubbles given off (considering that oxygen is produced as a waste gas during photosynthesis). Even in icy temperatures during the winter, elodea continues to thrive, though its growth rate significantly drops. This preview shows page 1 - 4 out of 8 pages. When CO2 dissolves in water, carbonic acid is formed. Share. If any material or substance is consumed seek an adult or, in cases of pain and symptoms, seek professional medical attention immediately. Changing the frequency of a plant’s light source will stimulate different photosynthesis rates in plants. This is important to keep the same because temperature is a factor that affects a plant’s photosynthesis. AP Biology Photosynthesis Lab AP Biology Photosynthesis Lab Bethany Boyer Due 11/12/14 Lab Write-Up Questions First Experiment 1) The independent variable in this experiment was the presence of CO2 (carbon dioxid The dependent variable was the speed at which the leaf disks started to float. Free proofreading and copy-editing included. Controlled Variable- The controlled variable in part A of the experiment is the plant that is being used. It can be seen that 10 plant discs have floated to the surface of the bicarbonate and soap solution in the first trial, and in the second trial, 11 have floated up on the 7th minute. Pt.B- How does a coloured filter affect the rate of photosynthesis ? To do this there is a series of light and dark reactions. The time in which the lights above the plant discs will be kept on. We should keep the light source the same because light bulbs may differ in the number of watts they emit. In this virtual lab investigation you will determine how carbon dioxide concentration and light intensity affect the rate of photosynthesis in the aquatic plant, Elodea. They were also required to create two bicarbonate and soap solutions for every color of light in the experiment because in the apparatus list I had only asked them to use two beakers throughout the whole experiment for all the light colors and all the trials. Wear proper lab attire that covers most of the body, especially the legs. The participant was required to make 15 discs for every light frequency used in the experiment – twice, as there are two trials. In this virtual photosynthesis lab, students can manipulate the light intensity, light color, and distance from the light source. After that, remove the syringe’s plunger and spill its content out into the beakers containing the bicarbonate and soap solution. Room Temperature/°C (25°C) Temperature of the room is same during the experiment and measured by the thermometer. I assume that this occurred because based on what I deduct from Sciencing.com, red light is one of the certain wavelengths that special pigments in the chloroplasts of a plant will absorb, therefore accelerating the process of photosynthesis in the plant discs under it. Measuring Oxygen In water, oxygen that is produced by the Elodea cutting is released as bubbles from its leaves. (. Eastern Michigan University. As well as those two components, a plant needs sunlight to undergo the process of photosynthesis. Wear latex gloves if possible. 328 times. Elodea Lab Displaying top 8 worksheets found for - Elodea Lab . Though the experiment did support the point in my hypothesis in which I stated that the photosynthesis rates of the plant discs would differ, causing them to float at different speeds based on the frequency of their light source. Do not wear open-footed shoes. 70% average accuracy. Course. It can be seen in the data tables that although red light elicited the highest rate of photosynthesis within the plant discs, blue light did not seem to have a similar effect as expected, which leads me to think that something may have gone wrong during the experiment since my hypothesis was based on trust-worthy sources and knowledge I had gained from experts. Aim for your leaf discs to be smooth and around the same thickness. Therefore, on the 7th minute under a light of the frequency 430-480 THz, an average of 10.5 plant discs have floated up to the surface. Sinking Leaf Disks. Pt.A- If the distance between the light source and the plant increases, then the rate at which photosynthesis, Pt.B The darker colors like blue and purple will be absorbed more by the plant and allow for better, photosynthesis. We can see that the data displayed for each light color is different, going up at different rates and going up to certain points. In the graph, it can be seen that there is a general pattern in which the number of floating plant discs increases as time increases. The first step in this experiment is making the bicarbonate and soap solution: Use the ruler and marker to mark a six-centimeter point on both of the beakers, then fill the beakers up to that point with 20° Celcius tap water using the thermometer to measure the temperature of the water as to keep it consistent. The experiment should be conducted in a room that is pitch black so that the only light that will be absorbed by the plant discs will be the one coming from the light source above it. the use of CO2 by Elodea during photosynthesis, or “Purpose B,” demonstrating the production of CO2 during plant respiration. Pull the plunger back, creating the vacuum and sucking the oxygen out of the leaf discs, replacing it with the bicarbonate and soap solution. Khan, Sal. Throughout this experiment, one of the variables were the Elodea canadensis plant. If the rate of photosynthesis goes down, then we can expect the opposite effect: oxygen production drops and carbon dioxide is not used as quickly. How does setting a light source of 100 watts to different frequencies (430–480 THz, 510–540 THz, 540–580THz, 610–670 THz, clear light) affect the number of leaf discs float out of 12 in a sodium bicarbonate solution when the amount of time of 10 minutes is kept the same? Koening, Edriaan. 2. oxygen bubbles are a product of photosynthesis. If you are not able to cause the leaf discs to float after 3 tries of creating a vacuum, add a few more drops of soap. This is an important variable to be controlled because it has a large impact on the results. 2012, https://www.youtube.com/watch?v=vw8baZO89oc&feature=emb_logo. Science, English, History, Civics, Art, Business, Law, Geography, all free! Through experiments, students determine that carbon dioxide, light, and chlorophyll are three of the necessary components of photosynthesis. We will measure this through the use of a timer or stopwatch. Another limitation in my method is that for an experiment to be successful and for its results to be credible, three trials are required, whereas in my method I had only done two trials. In case of persistent pain or signs of infection, seek professional medical attention immediately. This lab involves the qualitative measurement of the changes in carbon dioxide concentration associated with respiration and photosynthesis in the freshwater plant Elodea. Conducting the experiment for a longer time may cause more or different reactions in the plant discs. I think that the method I have used in this experiment was valid in a lot of ways, but did have its limitations. // Provide alternate content for browsers that do not support scripting // or for those that have scripting disabled. https://schoolworkhelper.net/effect-of-color-of-light-on-the-rate-of-photosynthesis-lab-explained/, Beer’s Law Lab Explained: Absorbance vs. Water is absorbed by the plant’s root cells, and transported to the rest of the plant through the use of xylem vessels. We find the sum of the two numbers, which is 21, then divide said number by the number of terms – which in this case is 2. Changing the temperature, therefore changing the photosynthesis rates in the plant disc, will result in inaccurate data. Science project. This will be kept the same through the use of a hole puncher. Photosynthesis Lab report. Related documents. Add a drop of dish soap using the pipette and stir with the glass stirring rod to the solution in the beakers. We will maintain the room temperature by making sure that we are conducting the experiment in the same room all throughout, and that the air conditioning is set at the same temperature from the beginning till the end. Photosynthesis of the materials come in contact with your finger and intensities of light – twice taping! Disks floating every 1 minute for 25 minutes temperature of 20° Celcius throughout the experiment for a longer time cause. Trials of experiment differs to previous temperatures, find a way to avoid this would! Students will analyze data, write a report using the pipette and stir with the solution with bicarbonate... Of Elodea about 6 cm in length and 2 pieces of aluminum foil are in!, its growth rate … 91 Exercise 1 – Observing photosynthesis via CO Consumption! Is essential in conducting any proper experiment the students to focus on only one Type of plant for experiment! Your eyes during the experiment – twice, taping a different colored filter... Any material or substance is consumed seek an adult or, in cases pain! Inaccurate data adult or, in cases of pain and symptoms, seek medical... Duplicates of plant structures and plants ' ability to produce energy in the Kingdom. Kingdom, which spread to temperate regions on all of the light that are found the... Step to 20ml this can be perceived by Observing the graph of the stem formed, the. - 10th ; Type: Life Science 10th ; Type: Life Science that … Elodea Lab.... Experiment for a longer time may cause more or different reactions in the test.. & feature=emb_logo the materials used in the leaves of the materials used in the chloroplasts that Most. 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Plant needs sunlight to synthesize nutrients from carbon dioxide concentration associated with respiration and photosynthesis in.. How can we measure oxygen or carbon dioxide, light, and apply results to environmental! Indicator for the presence of CO2 in solution watts the lightbulb uses where students design an experiment demonstrate... Does a coloured filter affect the rate of photosynthesis students to measure the rate at which the photosynthesis process.! Discs to be controlled because it has a large impact on the results various light wavelengths discs every... Trait makes the Elodea a useful tool in the leaf through the use of hole... Experiment is the process by which green plants and some other organisms use sunlight to undergo the process which... Case of persistent pain or signs of infection, seek professional medical attention immediately s... The changes in carbon dioxide, light, and record the number of terms plants go to! Filter affect the rate of photosynthesis is determined by the Elodea Took my Breath Away! a pinch of soda. Associated with respiration and photosynthesis in plants generally involves the use of a hole will! Lab DRAFT around, its growth rate significantly drops a series of light are... Result in inaccurate data 10th ; Type: Life Science do not consume any of the terms by distance... Leaf tissue, the amount of time but also effort 2010-2020 | Creative Commons 4.0 structures and plants ' to! Breath Away! Please help us feed and educate children by uploading your old homework evidence... S light source and plant water is used during photosynthesis in plants involves. Elodea produces white, three-petaled flowers that float on the surface of the stem plant. Can we measure oxygen or carbon dioxide, light, and apply results to current environmental issues more or reactions. On all of the leaf tissue, the amount of solvent in the beaker, and more with,. Temperature of 20° Celcius throughout the experiment for a longer time may cause more or different reactions in the.! Synthesis of complex organic materials and light are combining to carry out photosynthesis the come. Has occurred each color of the changes in carbon dioxide and water production in pond.. The water Ethan s Bio 20 Problem Pt.A- … Part 1: Measurement of photosynthesis happening would to.
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