It can even continue to grow unrooted, as floating fragments. I then filled each ice cream container with 500 ml of water and put above each container a 100 watt lamp attached to a stand distanced 20 cm from the container. Silty sediments and water rich in nutrients favour the growth of American waterweed in nutrient-rich lakes. Measure the ph of water using the ph meter. Photosynthesis is a food making process for algae and plants. 5) Place a light source 50cm away facing the test tube. 1985. Graph 2: Light colour vs length grown (cm), (Table 2. Waterfowl, especially ducks, as well as beaver and muskrat eat this plant. Photosynthesis Lab for AP biology where students use a sprig of elodea. Plants have four types of pigments, namely chlorophyll, carotenoids, anthocyanins, and xanthophylls. Measure the ph of water in each container after 5 days. We learned to use the calibration curve obtained from a known spectrum or measure the angle of diffraction to find out the wavelengths of unknown spectral lines. The photosynthesis process rate varies from different wavelengths and intensities of light. Thus, these short wavelengths have more energy and thus are optimal for photosynthetic activity. 5. 2) Crush the end of the stem at the site of incision gently. OXYGEN EVOLVED. Graph). Measure 500 ml of water using a beaker. I got the same ph 8 for all the containers. Graph the results placing temperature on the x-axis. 3) Submerge the plant into a test tube filled with 40mL room temperature water and 1g baking soda. This experiment was consisted of 4 different colours of light, Blue, Green, Red and Purple. Answer question 4 by making a Line Graph of the data in Table 3. Plug the 100 watt light bulb into the socket and switch it on. In order to test the light colour effect on the photosynthetic rate of the plant I decided to cover the ice cream container with coloured cellophane, I chose four colours Green, Red, Blue and purple. Bromthymol blue is used as an indicator for the presence of CO2 in solution. The, oxygen bubbles are a product of photosynthesis. under different wavelengths of light. Photosynthesis is one of the most remarkable biochemical processes found on Earth and allows plants to use sunlight to make food from water and carbon dioxide. It should be noted that I used a very dark blue cellophane colour; my purple cellophane colour was light so it is possible that if I used darker purple colour cellophane it might have produced a different results. Because of this for my repeat I had to make some major changes, I removed the lamp and decided to measure the length grown in each segment of elodea after 5 days. The values for the factor being varied should be on the x-axis, and the mean bubble rate in â¦ (For my daily results refer to my log book). The feeling of ... no definitive answers in regards to the light or the speakerâs internal despair. Count the bubbles to measure the rate of photosynthesis. The efficiency of photosynthesis can be measured, by the amount of oxygen bubbles formed during a given amount of time. These graphs have been plotted with rate of photosynthesis against the factor under investigation. Answer questions 5 and 6 based on your Line Graph 10.Answer question 7 based on the results of both Experiment 1 and Experiment 2. SURVEY . The basic structure of these plants are whirls of leaves around a stem that form a chain of long segments connected to looks like pipe cleaners with usually a diameter of about half an inch or so, depending on the species of elodea plants. For my repeat experiments I made some changes. Table 2: Light colour and the average length grown (cm) in five days. And the number of bubbles on the elodea segment everyday. 6) Turn on the light source and begin taking observations. Question 24 . only the ones that floated to the top of the test tube. The graph should show an increase in arbitrary units the further away from the light source the beaker is because the greater the distance from the light source, the lower the light intensity and so less photosynthesis would take ... Another error that was in my experiment was the fact that the elodea plants were bought from two different stores. The diagram given in this BiologyWise article is a small pictorial elaboration of the process of photosynthesis that will prove helpful for kids and teenagers to understand this vital process of the plant kingdom. Learn vocabulary, terms, and more with flashcards, games, and other study tools. It this case, number of bubbles of oxygen are counted given out in unit time by green aquatic plants like Hydrilla. This would then allow white light through but making the holes small and on the side of the container will reduce the amount of light through that is not of the colour group. Does photosynthesis performed by elodea remove CO2 from the water? Biology 4A Photosynthesis Laboratory (03/2020) Page 3 of 3 . In this experiment, the light intensity is changed by changing the distance of the source of light closer or further away from the elodea, so theoretically, when the intensity becomes stronger due to the light source being closer to the Elodea, the rate of photosynthesis should increase and therefore the number of oxygen bubbles will increase too. 7. Graph 1: Light Colour vs average number of bubbles per day (Table 1. Based on the data collected, the distance the lamp was placed from the test tube with the Elodea plant in it did affect the number of bubbles that formed and floated to the top of the test tube. Sign in|Recent Site Activity|Report Abuse|Print Page|Powered By Google Sites, Light Intensity and Rate of Photosynthesis (Carol Cao), The rate of photosynthesis is determined by the number of bubbles formed by the Elodea plants. The punched out leaf disks will initially sink in a test tube of water but will float as photosynthesis occurs. Because of this, the plants from one store can be of a completely different species than the plant of the other store. I did 3 experiments so altogether I collected 9 results for every colour so I added all the 9 results and divided the outcome by 9. Prepare a graph of the collected data and analyze it. Does light intensity affect the rate of photosynthesis in Elodea plants? Graph) Discussion: In this experiment I wanted to find out in what condition the elodea plant can grow and photosynthesis the best. 022; Ishanka Hemachandra; February 16th, 2017 Elodea canadensis, within six species of aquatic plants was derived from North and South America. Other follow-up experiments that can be done are to test other colours instead of the ones in this experiment like black lights and UV lights and light intensities of a wider range or an experiment to test the effect of temperature variations on the elodea plants. (Find a price that suits your requirements), The Term Paper on Photosynthesis Lab Report, The Term Paper on Light Quality On The Rate Of Photosynthesis Measure, The Essay on Plant Pigment Chromatography, The Term Paper on Spectrometer Experiment, Light Quality On The Rate Of Photosynthesis Measure, Emily Dickinson’s “A Certain Slant of Light” Analysis Essay. I decided to measure the ph of water after 5 days to see if there are any changes in ph. Simple experiments carried out by scientists shows that the rate of photosynthesis is critically dependent upon variables such as temperature, pH and intensity of light. (series). The dependent variable will be the number of bubbles formed and floated to the top of the test tube. Dickinson ... All Papers Are For Research And Reference Purposes Only. They were all like vines ... in plants subjected to green light verses plant growth in plants subjected to red light. Study the number of bubbles formed (dependent variable) as a function of time (independent variable) at various light distances from the test tube. 1) Cut a segment of the Elodea plant approximately 8cm with scissors. This is probably caused by the lack of oxygen and carbon dioxide circulation inside the ice cream containers. Before they begin the experiment, however, students must come up with a well-worded hypothesis to be â¦ 91 Exercise 1 â Observing Photosynthesis via CO 2 Consumption 1. 4 cellophane plastics (red, blue, purple and green). 3. With With each graph, make sure to include a title, equal intervals, labels for the x and y axes, and a key / legend ... g Plot data on a line graph. From this experiment, I can see that there is a significant variation in the effectiveness of different wavelengths of light upon photosynthetic rate. The rate of photosynthesis is measured by one of the following methods: By measuring (I) the volume of CO, consumed (2) volume of oxygen liberated (3) amount of carbohydrate accumulated. Place the 10 cm segment of elodea plant in each container. Students learn a simple technique for quantifying the amount of photosynthesis that occurs in a given period of time, using a common water plant (Elodea). These graphs have been plotted with rate of photosynthesis against the factor under investigation. Green light has a shorter wavelength than the red light but it had a lower rate because chlorophyll, the photosynthetic site, reflects the green colour and absorbs all others. This explains why the Elodea plants are green. Activity Option #3 â Role of Carbon Dioxide and Light (1) Set up the lamps at least several feet apart and away from windows. Graph). Does cellular respiration occur at a higher rate than photosynthesis in the tube with only elodea? Time is the independent variable and will be measured with a stop watch. By conducting this experiment, I was expecting to see as I mentioned in my hypothesis a heightened photosynthetic activity using purple and blue light. Factors Affecting Photosynthesis-Interactive. 1) Aquatic plant (Elodea) 2) Test tubes 3) Watch 4) Water (at room temperature) 5) Lamp (light source) 6) Knife/Scissors 7) Rulers 8) baking soda Procedures. This test will allow us to see which wavelength (colour) will allow the most light the elodea plant needs to flourish. Slice off a portion of the stem at an angle and lightly crush the cut end of the stem. Photosynthesis increases with the increase in temperature. Light’s colour is determined by its wavelength of light, and thus it is possible to devise an experiment to determine which wavelengths of light are most productive for photosynthesis than others. Background Emission Spectrum As we know, every atom has a set of discrete energy levels occupied by its electrons. Graph 2: Light colour vs length grown (cm), (Table 2. Describe what each of your chromatography strips looked like. I averaged the number of bubbles altogether eg I had 3 recordings for everyÂ colour per each set of experiments. Obtain 3 pieces of Elodea about 6 cm in length and 2 pieces of aluminum foil. An Analysis and Evaluation of Data from Photosynthesis Experiments Graph analysis This is my analysis for the investigation in to the affect of light intensity on the rate of photosynthesis to the Canadian pondweed, elodea. The data I collected and my graphs show that my hypothesis was right. Then a comparison can be made between the similarities of aquatic photosynthesisÂ and growth to that of terrestrial plants. Disclaimer: This work has been submitted by a student. A light source is split (in the example by a prism). Elodea plants are native to the New World, though a number of species have established themselves as invasive The rate of photosynthesis is often measured at different wavelengths of light, using the same sample of plant pigments. This is because these colours contain more energy, for according to the colour spectrum, they are of shorter wavelengths, and the shorter the wavelength, the more energy is present. The last day the green light plants were all over the tray container. adequate amounts of carbon dioxide for photosynthesis to occur. This is not an example of the work written by professional academic writers. A photon ... As shown by this experiment, photosynthetic rate varies greatly depending on the different colours of light used. When the temperature rises, the particles in the reaction move quicker and collide more, so the rate of photosynthesis rises also. Here are my averaged data results. Count the bubbles for 10 seconds, 30 seconds, and 60 seconds. Add water to test tube and a pinch of baking soda. This is because different colours are determined by different wavelengths, and some wavelengths are shorter than others. Silty sediments and water rich in nutrients favour the growth of American waterweed in nutrient-rich lakes. Label 4 screw cap tubes 1, 2, 3 and 4 with a marker and line them up in order in a test tube rack. Hypothesis: Yes, light intensity does affect the rate of photosynthesis. The gas should be checked to prove that it is indeed oxygen - relights a glowing splint. 9. Dissolved Oxygen production of . I predict that the plant under blue and purple light will have a higher photosynthetic rate because according to the colour spectrum, they are of shorter wavelength thus they have a higher energy.