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The Rate of Photosynthesis

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The Rate of Photosynthesis Planning Aim: I am going to investigate effect of light intensity on the rate of photosynthesis. Introduction: Photosynthesis is the process by which plants, some bacteria, and some microorganisms use the energy from sunlight to produce sugar, which cellular respiration converts into the "fuel" used by all living things. The conversion of unusable sunlight energy into usable chemical energy is associated with the actions of the green pigment chlorophyll. Most of the time, the photosynthetic process uses water and releases the oxygen and the food that we absolutely must have to stay alive. 6H2O + 6CO2 ----------> C6H12O6+ 6O2 The above chemical equation translates as: Six molecules of water plus six molecules of carbon dioxide produce one molecule of sugar plus six molecules of oxygen Diagram of a typical plant, showing the inputs and outputs of the photosynthetic process. Leaves and Leaf Structure Plants are the only photosynthetic organisms to have leaves (and not all plants have leaves). ...read more.


Second, trees (and all plants) sequester CO2 from the atmosphere during the process of photosynthesis and release oxygen. Scientific Knowledge: Sunlight plays a much larger role in our sustenance than we may expect: all the food we eat and all the fossil fuel we use is a product of photosynthesis, which is the process that converts energy in sunlight to chemical forms of energy that can be used by biological systems. Photosynthesis is carried out by many different organisms, ranging from plants to bacteria (Figure 1). The best-known form of photosynthesis is the one carried out by higher plants and algae, as well as by cyanobacteria and their relatives, which are responsible for a major part of photosynthesis in oceans. All these organisms convert CO2 (carbon dioxide) to organic material by reducing this gas to carbohydrates in a rather complex set of reactions. Electrons for this reduction reaction ultimately come from water, which is then converted to oxygen and protons. ...read more.


These bacteria do not evolve oxygen, but perform photosynthesis under anaerobic (oxygen-less) conditions. These bacteria efficiently use infrared light for photosynthesis. Infrared is light with wavelengths above 700 nm that cannot be seen by the human eye; some bacterial species can use infrared light with wavelengths of up to 1000 nm. However, most pigments are not very effective in absorbing ultraviolet light (<400 nm), which also cannot be seen by the human eye. Light with wavelengths below 330 nm becomes increasingly damaging to cells, but virtually all light at these short wavelengths is filtered out by the atmosphere (most prominently the ozone layer) before reaching the earth. Even though most plants are capable of producing compounds that absorb ultraviolet light, an increased exposure to light around 300 nm has detrimental effects on plant productivity. Fair Test: We did the experiment twice. We say many changes. On the first experiment, we did the bubbles weren't increasing at all, there were a few bubbles, but not that much. The longer we moved the light, ...read more.

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