temperature photosynthesis experiment results

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To investigate the effect of temperature on the rate of photosynthesis of  a Mauna Loa Supreme leaf. When the water bath was at 25 degrees Celsius, the rate of photosynthesis was very low and few bubbles were released. Thus the concentration of CO2 in the Also after the clock was stopped, different times were taken to pull the bubbles through, therefore allowing photosynthesis to occur a few moments longer. In the actual experiment I will keep the distance between the lamp and experiment constant. The average rate of oxygen released rose from 0.4mm3/min to 17mm3/min. Put the leaf disks in into the barrel of the syringe, with only a small volume of air, less than 10 percent. Therefore all bubbles will be together and give a more accurate reading as bubbles will not be missed. value, heat it more and repeat the steps in. An electron in the chlorophyll a molecule is excited to a higher energy level and is emitted from the chlorophyll molecule. Adding ice and warm water is not an accurate way to keep the temperature constant. Essay, 2 pages. Different pigments absorb different wavelengths of light. ���#D�u��=T�h(B�S)J����I��Qا� �S���()�Ea���JuQتz���^E>:�Ua� When the elodea has acclimatised for 1 minute, set the stop clock again, and leave for 5 minutes.

Pull the bubbles so that they line up with the scale, note down the volume of oxygen released. Investigating the effect of temperature on the rate of photosynthesis. How this experiment works is that you take a leaf disk, which naturally floats. It is an essential part of the life cycle, and the reason that plants are at the bottom of the food chain. Investigating the effect of temperature on the rate of photosynthesis 1. 2. This is the temperature at which enzymes work at their maximum rate. As photosynthesis begins, oxygen is released into the interior of the leaf.

The electron is then returned to the photosystem to become stable. By looking at my graph of average results from the class, the best fit curve starts to increase slowly from 0oC to 15oC, where is goes from 0.4mm3/min to 6mm3/min. heat water after measuring the amount of water because water evaporates as you Temperature of the water in the water bath in which the plant runs the photosynthesis reaction. 7 0 obj Work out the standard deviation of one set of data and square it. In this case, we added ice or warm water to allow the temperature to return to the desired.

The P700 of photosystem I absorbs electrons from photosystem II.

We did not measure the distance from the lamp to the experiment, therefore light intensity may have been different, making the experiment unfair and could lead to inaccuracies.

of the plant, from which the leaf that is going to be used for the As in cyclic photophosphorylation, ATP is synthesised by the ADP getting added to a phosphate group, as the electrons lose energy whilst passing along the carrier chain. The plants absorb the energy of light by proteins, held inside organelles known as chloroplast, with green chlorophyll pigments. At low temperature, the enzyme does not have enough energy to meet many substrate molecules, so the reaction is slowed.

Large volume, therefore temperature of water changes less quick, maintaining the desired temperature. He is an expert in solid-state physics, and during the day is a researcher at a Russell Group U.K. university. ZE���A This however is not very accurate as the meter constantly fluctuates. x���MO1���|\b! Other human errors could be the measurement of the volume of oxygen against the scale. Mean volume of oxygen released at 65oC = 4.929230769. I then went on to carrying out a preliminary experiment from which I learnt the factors that made the investigation inaccurate, therefore improving on them for my actual experiment. Photosynthesis is the process by which plants that contain chlorophyll use sunlight to convert carbon dioxide and water into carbohydrates and oxygen. For the temperature of 25oC the rate of oxygen released from the 3 sets of results has a maximum difference of 0.4mm3/min. 2. Complete step 3, for the second set of data. The line of best-fit increases steadily from 22oC and 35oC on graph 1, where the average rate of oxygen released went from 12mm3/min to 30.8mm3/min. Photosynthesis defines the process by which plants and some bacte… the same conditions. The mitochondria often referred to as the powerhouse cell is found in the eukaruotic cells.

This was very inaccurate, as the curvature of the lamp was different, therefore affecting the height of it also.

This is because most results are close to the trend line, and both graphs follow the same pattern. endobj At low temperatures the enzymes responsibility for photosynthesis have very Biology courses require writing lab reports. As the light intensity increases so does the rate. At low concentrations of carbon dioxide, the supply of carbon dioxide is the rate-limiting factor. %���� Place the lamp (the only light source) at a fixed distance from the plant. Straight after stopping the stop clock, we will slowly pull through the oxygen bubbles, with the syringe. The time to allow the elodea to photosynthesis will be kept the same; this will be 5 minutes and will be measured using a digital stop clock, as this is more accurate than a non-digital stop clock. You can compare results and discover the net photosynthesis time. After calculating, percentage Using a syringe, place some elodea water in the test tube along with the elodea. The substrate can no longer bind, and the reaction is no longer catalysed. Students looking for free, top-notch essay and term paper samples on various topics. We started our experiment with a temperature of 15oC. 3. 2 0 obj The thermometer was not as accurate as it could have been, as it was only accurate to 1oC. plant has different properties for carriyng on photosynthesis like the number This large increase occurs between 0oC and 24oC on graph 2 (class average). Experiments to investigate photosynthesis Greg Foot explains the effect of temperature, light intensity and carbon dioxide concentration on the rate of photosynthesis Investigating photosynthesis endobj endobj This because of that; two different amounts of water can give different energies leaf in it and the oxygen probe placed on it in the water bath. We used thermometers to measure temperature, as it is relatively accurate, to the nearest degree. This biology lab report template gives the main headings that students should use in their lab reports. temperature should be drawn. 1.

This is because during the 5 minutes the elodea was left, the temperature often drifted from what was needed. http://www.bio.umass.edu/biology/conn.river/calvin.html.

I would also do more repeats, if I could do the experiment again. The elodea is cut at a slant, as less air bubbles will be trapped. Make sure the elodea is at the top of the test tube and place it upside down in the beaker of water, keeping the test tube filled with as much water as possible. photosynthesis so the leaves should be same size and mass. A data logger will be a lot more accurate way of measuring fluctuations in temperature. The results of this experiment supported the group's hypothesis, because photosynthesis occurred more quickly at the lower temperature.

This is an lab report example about the process of osmosis, written for Biology course. Check stopwatch regularly so that time does not overrun. For 45oC the maximum difference between the results is 4.42mm3/min. This also stops gas exchange which slows photosynthesis even further. This is because the dark stage is controlled by the enzyme rubisco, which catalyses carbon dioxide and RuBP. Therefore we will need to be careful not to get water near the plug points, as their could be a risk of an electric shock. Therefore we had to always add ice, and warm water to the water bath. is one of the factors that affect the rate of photosynthesis of a plant. Only the weak hydrogen bonds are broken at these mild temperatures. The standard deviation is a measure of the extent to which individual measurements vary around the mean.

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