Aim. As the temperature increases so does the rate of photosynthesis, up until a certain point. As photosynthesis is controlled by enzymes as the temperature increases the rate of photosynthesis increases to an optimum then decreases. 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. 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. For this experiment I predict that the further the light is from the leaf the fewer bubbles will be produced. Two students were investigating the effect of light intensity on the rate of photosynthesis of elodea, an aquatic plant. At high light intensities the rate becomes. Other factors are concentration of carbon dioxide, temperature and to a lesser degree, water. However, if the light intensity is increased above a certain threshold, the rate of photosynthesis will not increase because another factor (such as temperature) is limiting the rate of the reaction. They exposed elodea to different amounts of light. Keywords: apple, drought stress, photosynthesis, photoprotection though restriction of CO2 diffusion from the air into carbox- ylation sites under mild to moderate drought conditions (Escalona et al. Light intensity is a factor that affects the rate of photosynthesis. Heat from other sources – Heat from sunlight which comes through the window into our classroom also can alter our experiment because it gives out heat which speeds up the reaction making our experiment unfair. 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. For most crop plants, even a slight increase or decrease in light intensity leads to considerable changes in leaf morphology and structure (Wu et al., 2017). The plant will be soaked into water so the oxygen can be measured easily. Also the distance of the light will have to be controlled by undertaking this there should be different levels of oxygen escaping the plant. Place a pond weed Elodea upside in a test tube containing water. The two graphs below is an interpretation of the table above, this graph is simpler to read. The hypothesis is as values of the light intensity increases, the production of oxygen gas will also increase. The light intensity percentage has to be calibrated against some particular intensity The rate of photosynthesis is indirectly measured by counting the number of bubbles of air (oxygen) produced by the water weed. Use of microorganisms and fermenter to manufacture enzymes, Use of microorganisms to manufacture antibiotic penicillin, Main nutrients: carbohydrates, fats and proteins, Food test 2 - Benedict's test for Reducing Sugars, Food test 3 - Emulsion (ethanol) test for Fats, Other Nutrients: Vitamins, Minerals, Fiber and Water, Using microorganism in making yoghurt and single cell protein, Food additives - uses, benefits and health hazards, Use of modern technology for increasing food production, Problems of world food supplies and the causes of famine, Absorption – function of the small intestine and significance of villi, Photosynthesis investigations - Principles and Starch test, Effect of Light intensity on the rate of Photosynthesis, Effect of Temperature on the Rate of Photosynthesis, Effect of Carbon Dioxide on the Rate of Photosynthesis, Optimum conditions for photosynthesis in Green house, Plant's mineral requirements and fertilisers, Distribution of Xylem and Phloem in roots, stems and leaves, Passage of water through root, stem and leaf, Transpiration in plants and factors affecting tranpiration rate, Adaptations of the leaf, stem and root to different environments, Translocation of applied chemicals throughout the plant, Transport of materials from sources to sinks at different seasons, Effect of exercise on heartbeat and causes of a coronary heart disease, Arteries, veins and capillaries - structure and functions, Immune system - antibody, tissue rejection. -length in double Rate distance Amount of oxygen, 3cm 5.7 5.7 5.7 5.7 30 30 30.5 30.1 3.5 19 15.9 12.8 1.2 3% 3% 3% 3%, 6cm 5.8 5.8 5.8 5.8 30 30 30 30 7.5 9 19.5 12 1.2 3% 3% 3% 3%, 9cm 5.7 5.7 5.7 5.7 30.5 30 30 30.1 20.2 19.5 15.5 18.4 1.8 3% 3% 3% 3%, 12cm 5.7 5.7 5.7 5.7 30 30 30 30 11 17.8 20 16.2 1.6 3% 3% 3% 3%, 15cm 5.6 5.6 5.6 5.6 30 30 30 30 19.9 13.3 17.7 16.8 1.6 3% 3% 3% 3%. Figure 1: equipment for making the algal balls. Therefore when the light is moved twice as far from the plant it will receive a quarter of the energy. The graph above is an interpretation of the tables above the graph. At low light intensities above the light compensation point (LCP), photosynthetic rate increases proportionally to the light intensity and reaches a maximum. Play this game to review Cell Structure. The intensity of light at different distances from a light source can be described by the inverse square law. In photosynthesis, a plant takes carbon dioxide from the air and water from the soil and uses the light from sunlight to turn them into food. Photosynthesis is controlled by an enzyme. The plant will be exposed to different light intensity in order to establish the correlation between light and rate of photosynthesis. Light intensity and the rate of photosynthesis – student notes: p. 2. The graph, in a simpler way, shows that the higher the light intensity the faster the rate of photosynthesis. I estimate that the error could have been up to 0.5cm. To overcome the problems above I will have to make sure to block off all other light entering the room other than the lamps light, to use a thermometer for accurate temperatures, use more pupils to count the bubbles with me and to make sure the distance of the light from the plant is accurate.
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