The influence of light on photosynthesis ContentsHome page and indexPage 1IntroductionPage 2Literature reviewPage 3 and 4Methodology and presentation of resultsPage 5 and 6Elaboration of resultsPage 7ConclusionPage 8IntroductionIn this project I believe that the result will be that light energy is essential for photosynthesis to occur. The aim was to demonstrate that light is necessary for photosynthesis. Photosynthesis is the process of converting light energy into chemical potential energy and storing it as starch. This process occurs in plants and some algae. Plants need light energy, CO2 and H2O to produce sugar. The process of photosynthesis occurs in chloroplasts, specifically using the chlorophyll in green leaves. In class we were told that the four factors necessary for photosynthesis are light, carbon dioxide, chlorophyll and temperature. The factor I decided to test was light because photosynthesis is often called “light reaction” and from this I knew that light had to be vital for the process to take place. The main source of energy during photosynthesis is light.Literature ReviewGrade 11 Transcript Biology - PhotosynthesisPhotosynthesis is a chemical process in which a plant uses solar energy to create organic compounds that store energy from carbon dioxide (C02). The plant uses sunlight to convert carbon dioxide and water into glucose, which is a carbohydrate. This all happens in the chloroplasts of leaf cells using chlorophyll. Chlorophyll absorbs solar energy and splits water molecules (H2O) releasing oxygen from the water molecule into the air. So, in the stroma of the chloroplasts, hydrogen...... middle of the paper ......ConclusionIn my experiment the areas deprived of sunlight did not change color when iodine was placed on them, so they did do not produce starch. This proves that they did not carry out photosynthesis. I tested the starch to see if photosynthesis had taken place because green plants use chlorophyll in their leaves to absorb light energy. They use light energy to react carbon dioxide with water to produce glucose. Glucose is used in respiration or converted to starch and stored. This is why I used the stretch test. In my first experiment, when I placed my plant on a windowsill with little sun, the plant did not perform any photosynthesis. The second time I exposed it to direct sunlight and the areas exposed to sunlight produced starch. Starch is only produced in areas that receive light, proving that light is necessary for photosynthesis.