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Photosynthesis is the process by which green plants and certain other organisms transform inorganic compounds to organic compounds.

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Introduction Photosynthesis is the process by which green plants and certain other organisms transform inorganic compounds to organic compounds. There are primarily two pathways of photosynthesis. One being light reactions, driven by light energy, product of this process is ATP and reduced electron carrier [NADPH + H+]. The second pathway is called calvin-Benson cycle, this cycle does not need light and instead it uses ATP, NADPH + H+ and CO2. The rate of photosynthesis is affected by a number of factors including light quality and quantity, CO2, temperature, availability of water, and availability of nutrients. If the conditions that the plant needs are improved the rate of photosynthesis should increase and vice versa. Carbon dioxide concentration will directly affect the rate of photosynthesis as it is used in the photosynthesis reaction. Light is also directly used in the photosynthesis reaction. Carbon Dioxide and Light are the factors that will be changed in the experiment. Photosynthesis Reaction: Materials and method: Materials used in this experiment are as follows: I) Syringes. II) Cork borer and rubber stopper III) ...read more.


Another variable that is varied is CO2 as seen in equation [1] CO2 is a necessity alongside water and light energy, some groups used dH2O while others used NaHCO3, NaHCO3 is actually a source of CO2. Other variables such as temperature, water etc are fixed variable and are tried to be kept at a constant. Results The following results were obtained [table 9.1 and fig. 9.2]: Elapsed Time Chamber 1 (dH20) Chamber 2 (NaHCO3) NDF % NDF % 2 0 0 1 10 4 2 20 1 10 6 2 20 2 20 8 1 10 1 10 10 0 0 1 10 12 1 10 1 10 14 1 10 1 10 16 0 0 2 20 18 2 20 1 10 Discussion The above figure and table clearly prove that the rate of photosynthesis is controlled by many different factors, light and CO2 being the one used. Light quality [nm range] was different for each group, as mentioned before photosynthesis best occurs in the range of 400-450 and 650-700 nm which is blue and red light. ...read more.


Furthermore some of the oxygen produced would have dissolved into the medium the disc was suspended in. Another more unlikely, yet possible error source would be the microscopic animals living on the disc might have used some [very very very minute] oxygen. The light source itself could be regarded as a source of error! The source itself wasn't the only source in the room, the rooms fluorescent lighting was surely getting to the discs while quantities of photons from other groups would also have reached the discs. Other sources of error would involve the lab partners themselves; while creating the vacuum the index finger may have not fully sealed the chamber thus reaching only partial vacuum; hence not a complete extraction of oxygen present in the discs. In a nutshell, this experiment proves the equation [1] that both CO2 and light energy both affect the rate of photosynthesis: In this specific experiment the leaf discs that undergo photosynthesis are the one under the red or no filter with NaHCO3. ...read more.

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