THE FACTOR AFFECTING THE RATE OF PHOTOSYNTHESIS: WAVELENGTH OF LIGHTİpek Kâhya10BNo:551CONTENTSAutotrophischemoautotrophs photoautotrophs PhotosynthesisFactors influencing the rate of photosynthesisEnvironmentalGeneticsLaboratory reportIntroductionPurposeMaterialsExperimental setupPro ceduraAnalisi2Autotrophs can build organic compounds from simple molecules such as water and anhydride carbonic and their type of nutrition is called autotrophic nutrition. As they build complex molecules, they need large amounts of energy. They are divided into two groups based on the energy source: chemoautotrophs and photoautotrophs. Chemoautotrophs can synthesize organic compounds from CO₂ and H₂O using inorganic oxidation energy and do not require sunlight. However, photoautotrophs, including green plants, produce sugar and O₂ from CO₂ and H₂O using sunlight. The green pigment that absorbs light is called chlorophyll and this process is called photosynthesis. Photosynthesis can occur in any green part of the plant. This green part contains chloroplasts. Chloroplasts separate photosynthesis and other cellular activities. The cytoplasm like liquid, the stroma, in the chloroplast is made up of the ribosome, DNA and enzymes that take part in photosynthesis. There are two phases in photosynthesis: light-dependent and light-independent. In the light-dependent phase, using light energy, water is split into hydrogen and oxygen. In the light-independent phase, hydrogen reacts with CO₂. Furthermore, the water is reformed. This phase occurs both when it is dark and when it is light. Photosynthesis plays a very important role in our life. Michael Roberts says: "Although it is difficult to arrive at a total world figure for photos......half of the paper......k, separate one leaf from both plants. Drop iodine on both leaves .6Analysis:When I dropped the iodine on the leaf where I had separated from the plant that had been waiting in the red light, its color changed to blue. However, when I dropped the iodine on the leaf that I had separated from the plant that had waited under green light, its color remained the same. It is because the plant waited under red light could do more photosynthesis than the other, so it has more glucose and an iodine solution makes the color of the substance blue if it contains starch used to test for the presence of starch.7WORKS CITEDAydın Parim, Ganime. Biology with activity. Istanbul: Orano, Print.Kent, Michael. Oxford: Oxford UP, 2000. Roberts, Michael J. Reiss and Grace Monger. Advanced Biology. Walton-on-Thames: Nelson, 2000. Print.Works Cited