Variables. According to Reckitt Benckiser (2016), as light intensity decreases the rate of photosynthesis also decreases in an almost linear pattern. While the higher photorespiration rate (Pr) under stronger light condition was mainly caused by faster water loss rate of light. Also we want to know if the rate of water could affect the photosynthesis process. Results Distance (cm) Light Intensity (Arb Units) Amount Of Bubbles (Per min) Average 20 4. However, the Chl a/b ratio gradually decreased. Convert your results to a rate in mm3 min−1 and record your results in a suitable table. Introduction Photosynthesis is an important process in plants in which light energy is converted to chemical energy for life’s processes that are necessary for survival of the plant (Karp 2008). identify the inverse relationship between Light intensity and distance of lamp from the … That mean the rate of photosynthesis also decreases in this graph. The light intensity range for most plants falls between 1,200 and 2,000 lumens (measurement of light intensity). In this experiment a 100 Watt bulb was used. 1. Q1: Give 3 limiting factors to the rate of photosynthesis. When there is a slower rate, there is less oxygen produced, thus the amount of bubbles floating through the . After point x another factor might be affecting the rate of photosynthesis, which is known as a ‘limiting factor’. (3 marks) Q2: Discuss how light intensity affects the rate of photosynthesis. Rate of photosynthesis was determined at pH 7, 0.2% NaHCO3, room temperature, and under white light using light intensities of 2200, 4250, 5300, 14400, 20600 lux. (this is where you should use your results and scientific knowledge) Ultimately, the higher the light intensity the less time it takes for the indicator to turn purple. 8 10 13 9 11 My results clearly show that the closer the lamp was to the plant the quicker the rate of photosynthesis is. Tes Global Ltd is registered in England (Company No 02017289) with its registered office … Our results also demonstrated that the enhancement the de-epoxidations of xanthophyll cycle, activities of ascorbate peroxidase (APX) and catalase (CAT) were directly regulated by light intensity. Results_____ Rate of dye reduction Distance from light intensity (m) The graph shows that the distance from light intensity are increased when the rate of dye reduction decrease between 0.3m to 1.1m. Plot a graph to show the mean rate of photosynthesis for each type of filter. As light intensity decreases with the distance, these observations suggest that decreasing light intensity had a negative impact on the number of bubbles produced. 5 41 44 39 4140 3. The results indeed show that the amount of light intensity and oxygen go up in a directly proportional rate. Light intensity. This implies that the net rate of photosynthesis was greater than the net rate of respiration. From the equation above, O_2 is a product from the process of photosynthesis. 3. Therefore, the more light, the faster the pondweed will photosynthesis. 2. However, at some point there's a limit that the rate of photosynthesis cannot increase above. This website and its content is subject to our Terms and Conditions. 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. For maximum photosynthesis, and therefore plant growth, common agriculture practices incorporate techniques to remove limiting factors. Keeping the light intensity the same means it will have no additional effect on the rate of photosynthesis. This study was undertaken to determine the relationship between of light intensity and rate of photosynthesis in spinach leaves. How Light Intensity Affect Photosynthesis. Photosynthesis in plants is affected by the intensity of the light the plant is exposed to. Related. A change of light intensity would result in a change of photosynthesis rate. We are using 2 kinds of light bulbs, which are the 40 watt one and the 60 watt one. Calculate the mean results for each colour of filter. Show More. Analysis & Conclusions. The results showed that (1) L. litseifolius is a typical heliophyte. When the light intensity is increased, the rate of bubble production should increase. After each exposure, the cuvettes were placed in a spectrophotometer set at 621 nm and the absorbance of DCPIP was measured. How does light intensity and carbon dioxide levels affect photosynthesis rate Phaladi Phaladi 201102379 Department Of Mathematics And Science Education University Of Botswana Plants, through the use of chlorophyll (green pigment in plants) that traps light can generate ‘food’ by combining carbon dioxide in the air and water. Light Intensity = Power/Area. Activities for the students were;-design sensible experiment method-revise different types of variables. Dec. 15, 2020. (3 marks) Q3: The graph below shows a plant’s rate of photosynthesis. At low light, the response is linear and at high light the response plateaus. For this experiment, DCPIP was added to cuvettes with spinach chloroplasts, which were exposed to an incandescent light at different distances for different intervals of time. 8 22 15 17 1880 1. Therefore, a sensible results table has been prepared, to share with the students. and the rate of bubbling can serve as an indication of the rate of photosynthesis. a Rinse 6 translucent bottles with hydrogencarbonate indicator solution. 0 23 23 21 2260 1. This procedure offers a method for measuring the rate of photosynthesis which depends directly on the rate of uptake of ... investigating light intensity. According to these information, Graph 1 can be analysis on the Rate of Change of Photosynthesis vs. Light Intensity. _Table 1: The Effect of the Distance of the Light Intensity to Rate of Photosynthesis_ Light Intensity (lux) (+/-100lux) Rate of Photosynthesis (number of bubbles) (+/- 1 bubble) Plant 1 Plant 2 Plant 3 Plant 4 Plant 5 Plant 6 Plant 7 Plant 8 Plant 9 Plant 10 Plant 11 Plant 12 8400 73 23 209 43 3 1380 104 6 22 9 20 4 3800 41 115 92 65 82 155 114 42 Photosynthesis Abstract: An experiment was carried out to determine how certain factors such as light intensity and availability of carbon dioxide, affected the rate of photosynthesis. The effect of light intensity on the rate of photosynthesis. Results. As the bulb emits light in all direction we use the area of a sphere with the radius being the distance from the pond weed. As the light intensity decreased, the contents of chlorophyll a (Chl a), chlorophyll b (Chl b) and total chlorophyll (Chl a + b) all increased. This in turn increases the rate of photosynthesis. Koz 8 Analysis: If the distance between the plant and source increases, then the light intensity decreases. 0 14 13 15 14100 0. Photosynthesis. The results should indicate that the light-dependent reactions of photosynthesis are restricted to the chloroplasts that have been extracted. (3 marks) Temperature (OC) The rate of photosynthesis was measure by the amount of oxygen produce (cm3/min). I predict that as the light intensity increases that the rate of photosynthesis will increase in proportion, so for example if you increase the light intensity from 10cm away to 20 cm away form a stationary plant. This experiment will look at the affect of light intensity on the rate of photosynthesis on Elodea plants. They are inversely proportional for each other. Discuss the results shown in the graph. The aim of my experiment is to find out how light intensity affects the rate of photosynthesis. In most cases, the more light the faster photosynthesis occurs. Figure 1 illustrates that as light intensity increases, photosynthetic rate also increases. Revision booklet and an accompanying PowerPoint for the CB6 core practical all about light intensity and photosynthesis. The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place Hypothesis: I predict that as the intensity of light is increased, so would the photosynthesis. These could be temperature, carbon dioxide concentration or light intensity. ... rate of photosynthesis lab results. 3 Students should describe a procedure in which light intensity is varied but temperature is controlled. Blog. Light intensity has a very large effect on the rate of photosynthesis. 2 Carbon dioxide will have no effect, because it is not involved in the light-dependent reactions. I can tell this because as I increase the light intensity, the amount of bubbles increased also (oxygen). In zero light, oxygen is being consumed, representing mitochondrial respiration. b Add equal numbers of algal balls to each container – around 20. c Add a standard volume of indicator to each container (7–10 cm 3). Decrease the light intensity and the rate of bubbling should decrease. At low light intensity, photosynthesis occurs slowly because only a small quantity of ATP and NADPH is created by the light dependent reactions. The number of light photons hitting the chlorophyll pigments increase as the light intensity rises. Light Intensity and the Rate of Photosynthesis. Prediction . This is because light effects the rate of photosynthesis. Top 10 blogs in 2020 for remote teaching and learning; Dec. 11, 2020 It includes starter questions all about photosynthesis, explaining certain aspects of the method, thinking about the different variables, calculating the rate of photosynthesis, drawing a graph, analysing results and past paper exam questions. 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. The number of bubbles given off in a minute is taken as the rate of photosynthesis and plotted against the calculated light intensity. However, as our results were not statistically significant, further studies would have to be performed to determine the effect of light intensity on photosynthesis in E. canadensis. How to increase brand awareness through consistency; Dec. 11, 2020. At a light intensity of 50 arbitrary units for the shade grown plant, and 150 arbitrary units for the light grown plant, the rate of change in CO2 levels was a negative value (-1.5, -10.4). Therefore, there is less H^+ ions being pumped which results in the slower rate for photosynthesis. 4. The secondary data above backs-up my prediction because it shows that, as the intensity of light increases, so does the rate of photosynthesis until point x. Indicate the spread of data using the range or standard deviation. As light intensity increases, more ATP and NADPH are created, thus increasing the photosynthetic rate. d Replace the lid. 2), we want to determine the intensity and distance from light affect the rate of photosynthesis in aquatic plant because the plant itself needs more water to grow. This is because it's limited by other factors, such as the level of carbon dioxide in the air. The reason that light intensity does affect the rate of photosynthesis is because as light, and therefore energy, falls on the chloroplasts in a leaf, it is trapped by the chlorophyll, which then makes the energy available for chemical reactions in the plant. 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