The Divine of Ryans
...ndependent Variable - Quality (color) of light (ex. Natural color, yellow color, etc.) 4.2 Dependent Variable - Amount of oxygen gas produced 4.3 Controlled Variables - 1. Intensity of light - 2. Photoperiod of light - 3. Concentration of carbon dioxide - 4. Temperature - 5. Quantity of plants placed into four test tubes - 6. Size of test tube 5. Observation: Test Tube Amount of Oxygen gas produced Natural Color The greatest amount of oxygen gas had been produced. (1.4cm from the top was empty) Yellow The second least amount of oxygen gas had been produced. (0.9cm from the top was empty) Green The least amount of oxygen gas had been produced. (0.5cm from the top was empty) Red The second greatest amount of oxygen gas had been produced. (1.2cm from the top was empty) 6. Discussion: 6.1 Analyze Every organism on earth requires constant amount of energy. The main source of this energy comes from the sun. Unfortunately, light energy cannot be converted into other forms of energy that can be used in organism directly even in photosynthetic plants. Energy light must be trapped in order to be converted into useful energy for organisms. Photosynthesis is the process by which carbohydrates are synthesized from carbon dioxide and water using light as an energy source. So, there is the set of molecules that are responsible for capturing light and converting light energy to chemical energy, called ATP. One of molecules, called chloroplast, is a series of folded membranes. The surface of the membranes is covered with light trapping pigment molecules called chlorophylls. Electrons, which help conversion of light within, within chlorophylls, are excited by captured photons of light. Therefore, light energy plays significant role of photosynthesis. Since a relatively narrow portion or the visible light spectrum is most active in photosynthesis (explained later), the quality of light affects the rate of photosynthesis. This experiment showed that the amount of oxygen gas produced was the greatest when it was lightened by natural light following by red, yellow and green light. This is because of characteristic of chlorophylls. Light is a form of energy that travels in wave packets called photons. Photosystems absorb photons of particular wavelengths and, through light reactions, transfer their energy to form ATP and NADPH. Especially, chlorophyll a and b involve in photosystems absorb most photons. The important thing is that red and...