For most plants, this process takes place in the leaves … The more light and heat given off the plant the more energy is going in, which means the more bubbles produced. The amount of trapped light energy and the amount of carbon Select the BAR CHART tab. , Joan, 1 Comment, September 5, 2016 What is the name of the organelle that carries out photosynthesis? More oxygen bubbles are produced when the light is closer to the beaker. After you remove the light and place the cups in the dark, the treatment disks should stop undergoing photosynthesis and the disks should begin to sink. To use pondweed to see how light intensity affects the rate of photosynthesis. It is an endothermic (takes in heat) chemical process that uses sunlight to turn carbon dioxide into sugars. The evolution of bubbles indicates the rate of photosynthesis in elodea. You can’t just throw on the one you bought 10 years ago or borrow a friend’s. 1. Dim sunlight – Photosynthesis rate equals respiration rate. Bubbles are given off by the plant through photosynthesis. - the size of the pondweed, the volume of water used and its temperature. On the basis of the rate of bubble production observed, students should determine over what period of time (e.g., 15, 30, or 60 s) bubble production should be measured; the greater the bubble production, the less time necessary. As light intensity increases, so does the rate of photosynthesis and more bubbles are given off as a product of the reaction.” (Lapa T., n.d., Conclusion para. Procedure. Science people discovered that plants have shown to produce more bubbles when they were placed closer to a light source than further away. Set the simulator to Carbon dioxide (CO 2) Level 6.0. The bubbles should cause the disks to float. In the dataset below, the rates of photosynthesis (by way of floating leaf-discs) between two different types of plants are compared. The effect is that the higher the light intensity the increase in the amount of bubbles produced, this bubble produced from the plant is oxygen. , cherran, No Comment, June 25, 2016 Arya: I think the bubbles are oxygen and carbon dioxide. Why is this? What is the rate of photosynthesis if 46 bubbles were produced in 2 minutes? Without photosynthesis, we wouldn’t have oxygen or food to stay alive. Why is it important that you keep two variables constant (such as light level and color) while you're testing how a third variable (CO2 Level) affects photosynthesis? , Joan, 1 Comment, August 28, 2016 It is interesting to know that the oxygen bubbles are a product of photosynthesis. 1 decade ago. 1 Answer. __ CO2 molecules_____ 2. This experiment provides that experiment hypothesis and data are supported. describe your procedure. Photosynthesis also uses carbon dioxide faster than respiration produces it. Answer Save. An assumption being made in this experiment is that the gas bubbles being counted are only oxygen, and that production of oxygen is proportional to the rate of photosynthesis. 2 See answers B) 46 bubbles per 2 minutes No wait 3rd one yeah divede 46 by two is 3 3rd option c is your answer thanks a lot lestervalle082 lestervalle082 Answer: C.23 bubbles per minute. This is an example of a common experiment used to investigate light intensity and the rate of photosynthesis. Algal Photosynthesis (GCSE) Get algae culture (cells) solution . Since the oxygen bubbles are a product of photosynthesis, one can conclude that the more bubbles formed, the more photosynthesis occurred, thus increasing the rate of photosynthesis. This should help you understand how to work scientifically. For comparison purposes, each lab group that does this procedure should report the time at which half (5) of the disks is floating. Move the Light intensity slider back and forth. - the light intensity (how close the light is). Add equal volume of algae culture and sodium alginate into a beaker . Furthermore, also note the light intensity values in lux. Not too many people know that the rate of photosynthesis is determined by the number of bubbles formed by the Elodea plants. Observe the left pane closely. In this lab, we will study the effect of light intensity and quality (wave length - color) on photosynthesis. Needless to say, the efficiency of photosynthesis can be measured by the amount of oxygen bubbles formed during a given amount of time. Experiment 1:Set the thermometer to 25°C (Room Temperature) and the light intensity to 20. 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. Students may answer that they know photosynthesis produces oxygen, so the bubbles must have been oxygen. Read about our approach to external linking. The rate of photosynthesis will vary depending on the intensity of the sunlight and other factors, but slowly the oxygen will collect in the test tube. For comparison purposes, each lab group that does this procedure should report the time at which half (5) of the disks is floating. You have to understand that the bubbles counted were only the ones that floated to the top of the test tube. what is another way that the intensity of the light could be tested? September 23, 2013 2.) Using what you know about photosynthesis… The mass potometer consists of a plant with its root submerged in a beaker. photosynthesis by measuring oxygen production. Oxygen is consumed while carbon dioxide is released in plant respiration at night. , charm Invert the syringe upside down using a clamp stand . 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