However, due to practical time constraints in taking the readings for my investigation, and some consequential problems relating to time extension, I could not in fact make these adjustments. Overall, I felt that due to the small volumes of oxygen involved, my experiment was not as accurate as it could have been, however I believe it was accurate enough to support and justify my hypotheses. Middle The light intensity was measured in the same way as described in the preliminary experiment, and assumed to be the same at any point at any particular distance. Treatments were performed at room temperature. They do this by a process called photosynthesis. Observations of the color of light requested in table 4 can be obtained by placing a strip of paper in a clean, dry cuvette and inserting it into the spectrophotometer.
I am using pondweed because of its unusual quality of giving off bubbles of gas from a cut end, when placed in… 1148 Words 5 Pages around the world in a wide variety of environments, but how does the environment affect photosynthesis rate? The reason for this was that this might have been due to the light energy absorbed by the plant. This would have been subtracted from the rates of photosynthesis of the other treatments to make the correction. Notice that there is a time period called the lag period between the time the lights are turned on and when photosynthesis reaches steady state. 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. An example of this would be the leaves of a plant. One problem, though a small one, is in the time keeping.
If for one reading, the minute was started just after one bubble had been produced, and in another reading it was just before, this could have had a negative effect on the accuracy of my results. Rate of photosynthesis was determined at pH 7, 0. At the edge of the reef flat, the reef crest is predominantly encrusted with Porolithon sp. In the results the pattern is that when the light intensity is higher the readings are generally higher. Repeat for all other readings, and then repeat all readings a second time to get an average result for each distance. The Light Compensation Point Notice that when extrapolated down, the light response curve does not pass through the origin of the graph.
The overall effect is that energy is transferred from sunlight to sugar molecules. To obtain a true reading of the volume change, you must subtract the control reading from the Elodea reading. Spinach leaf segments were infiltrated with 0. Introduction: Photosynthesis is a process that underlies all life on Earth. In order for photosynthesis to occur sunlight, carbon dioxide, and water are essential, however oxygen is produced in the process. Choose a healthy specimen with an actively growing leaf bud t the apex.
This may have been because the watcher might have not counted all the bubbles. Background information: Photosynthesis Photosynthesis is the process of autotrophs turning carbon dioxide and water into carbohydrates and oxygen, using light energy from sunlight. The energy inside molecules is called chemical energy, so light energy is converted into chemical energy by the chlorophyll. Light compensation point, when the rate of oxygen production by photosynthesis equals rate of oxygen consumption by respiration in plants was approximated to be 83cm by graphing the rate of oxygen production and figuring out when it hits the x axis fig 2. Furthermore, I predict that if the light intensity increases, the rate of photosynthesis will increase at a proportional rate and more oxygen will be produced and therefore the oxygen levels will increase. When… 2410 Words 10 Pages experiment conducted by Claire Dunne, Eilis Brien and myself about the effects of light intensity, representing the three seasons of summer, spring, autumn and winter, on the transpiration rate of mangrove shoots. Light The rate of photosynthesis increases when light gets brighter.
For example, the figure below shows O 2 evolution curves when photosynthesis was allowed to occur in the presence of two different light levels. So the rate of oxygen production is probably significantly lower than the data reported. Introduction Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Offer an explanation of the results, taking into account the principles of photosynthesis and the light reaction. 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. For photosynthesis to take place, energy from the sun is required.
In this experiment, number of leaf floating segments floating were counted at five minute intervals for 20 minutes. This would affect the experiment, as the light source would not be directly hitting the pondweed. To extend my enquiries into the rate of photosynthesis, I could perhaps try to link in some of the other limiting factors to the same experiment, as well as investigating them in their own right. Too much light at a high intensity can damage chloroplasts. This figure shows regression lines drawn through the steady-state regions of the O 2 evolution curves. The rate of oxygen production as measured by percent of floating leaf segments after five minutes was graphed against light intensity. One possible explanation for this error could be due to seal.
Gradually the rate falls of and at a certain light intensity the rate of photosynthesis stay constant from point B to C on the graph. If the choice was mine, I would place them into violet light, because almost none of it would be reflected. The rate of oxygen production increased relatively rapidly at lower light intensities but leveled off at intensities greater than 5300 lux, suggesting that light intensity is a limiting factor of photosynthesis below 5300 lux. Do not misinterpret this to mean that photosynthesis does not occur at light levels below this point, there is a better explanation. Factors affecting the rate of photosynthesis 1.
Data Variables not separated, data disorganized, trends not apparent. Apparatus: - Test tube- this is used to collect the left over oxygen. The test tube was suppose to be completely isolated but the seal may have been compromised and let air in and out. Since the light is being reflectd, the cells do not get any light. Photosynthesis occurs only in the presence of light and takes place in the chloroplasts of green cells.