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​ ​ Chris Wallner 10/20/09 7/8 Photosynthesis vs. Cell Respiration

There are many differences and similarities between photosynthesis and cell respiration. They both depend on each other and are both very important in the life of plants. Without these 2 forms of creating energy all life forms couldn’t exist. Photosynthesis only occurs in autotrophs (plants). Photosynthesis is where sunlight or light energy is eventually converted into glucose and is the plants main energy source. Photosynthesis happens in the chloroplasts which has 2 parts, which are the stroma and thylakoids. The thylakoids are the individual disks that take in the sunlight and convert it into glucose. The stroma is the gel like substance (inside the cell surrounding the thylakoids) outside the cell. The 2 stages of photosynthesis are the light (reaction, not dependent) dependant stage and the Calvin cycle stage also known as light independent. The light (reaction) dependant stage absorbs the light in the thylakoids, water atoms are split and oxygen diffuses out of the cell which causes ATP to be produced. The second stage is the Calvin cycle which is when ATP and carbon dioxide are used to produce the glucose that will supply the plant with food. The products of photosynthesis (are) is oxygen and sugar, the reactants are carbon dioxide and water. The equation for photosynthesis is 6CO 2 +6H 2 O=C 6 H 12 O 6 +6O 2. Cell respiration is in both heterotrophs (animals) and autotrophs (plants). Cell respiration is where the mitochondria use glucose and oxygen to create a chemical reaction to make ATP. This happens in the mitochondria and cytoplasm. The products are water and carbon dioxide; the reactants are oxygen and sugar. This process is used to create energy so you can use it to heat you body (heat energy) and to move (mechanical energy). Cell respiration has 3 cycles, they are glycolysis, the Krebs cycle, and then the electron transport chain also known as ETC. Glycolisis needs 2 ATP molecules to start the process. It breaks down glucose (chemical energy) into pyruvic acid and 4 molecules of ATP. Next is the Krebs cycle which produces 2 ATP and last is the ETC which produces 32 ATP. 62% of this energy is released as heat.

Cell respiration happens in both cells. Both create energy and both depend greatly on each other in a plant. Also they both have some sort of gas exchange. They both have their differences but the main idea is the same, create energy.

Cassie P.-M. 7/8 10/22/09 Cell Respiration and Photosynthesis Lenny  the plant and Bob the dinosaur were the best of friends; except when Bob snacked on Lenny. Now, Lenny used light energy to make sugar and energy. This process is called photosynthesis. The only reason Lenny could use photosynthesis was because he was an autotroph. Bob, on the other hand, was a heterotroph. This meant that Bob got his energy from eating other things, such as plants. Bob didn’t know how to do photosynthesis, so he would do cell respiration instead dioxide **//__what is the dioxide supposed to mean?(__//** this sentance doesn't make any sence to me). The equation for cellular respiration is C6H12O6+6O2 CO2+6H2O; this means that the reaction is that oxygen and sugar are used to create carbon dioxide and water which plants use in photosynthesis. In photosynthesis, structures called chloroplasts use the light energy from photosynthesis to make chemical energy. Chloroplasts contain thylakoids, which have photosynthetic pigments, and stroma. Stroma is a gel like material that surrounds the thylakoids. A light independent factor is the Calvin cycle; in this cycle ATP and carbon dioxide are used to create the sugar glucose. Light dependent factors are that the light absorbed in thylakoids, water is split, and oxygen diffuses out which makes ATP. Glycolysis happens during cell respiration; Glycolysis forms pyruvic acid and does or does not require oxygen. When Glycolysis has oxygen it leads to the Krebs cycle which leads to ETC, or electron transport chain for short.**//__(switch around the ETC and the electron trasport chain does not make sence this way) __//** The Krebs cycle and ETC happen in the mitochondria; however, some other cell respiration happens in the cytoplasm also .(**//__mention that glycolysis is the thing that happens in the cytoplasum)__//** When Glycolysis happens without oxygen it yields ATP; only 38% of that energy is used, the other 62% is used as heat energy in your body. From cell respiration some of that energy is used to help your body function and move properly, this is called mechanical energy. Lenny and Bob explained photosynthesis and cell respiration quite well to each other, apart from when Bob had a small snack out of Lenny.  __Cell respiration vs. photosynthesis__ by bethany morris All plants and animals have to undergo processes that enable them to live. Animals (or heterotrophs) undergo cell respiration while plants (or autotrophs) undergo photosynthesis. Some of you might be wondering what is the difference between these two? First let us examine photosynthesis. Photo means light and synthesis means to put together. This means that it is light dependant and uses light energy to survive. It gets light through the chloroplast. The chloroplast has two main parts the thyakoid and the stroma that allow the plants to obtain energy and the plant to get its green color. In a plant cell photosynthesis takes place in the chloroplast. The equation for this process is 6CO2 + 6H2O= C6H12O6+ 6O2. This means that a plant takes carbon dioxide and water, and uses the water and light (light is not in the equation but it is used) to go through the light reactions process to turn the water and carbon into oxygen, then uses the Calvin cycle to change the carbon dioxide into sugar. This process is what supports animal’s life here on earth. Plants provide energy and oxygen so other living things may survive. Now comes cellular respiration. Cellular respiration occurs in animal cells. Unlike plant cells, animal cells do not have the ability to create energy from sunlight, so they use chemical energy and mechanical energy instead. Animal cells go through three cycles to obtain energy glycolisis, the Krebs cycle and the electron transport chain. Glycolisis is a way to get anaerobic energy meaning it does not require oxygen to provide energy. Glycolisis allows us to sprint or do other things that make us work to fast to get oxygen and it is the only cycle to take place in the cytoplasm but it only creates two ATP. This reaction is also called fermentation. Fermentation has the equation or pyruvic acid =lactic acid+ energy. The other two cycles take place in the mitochondria and are aerobic meaning that they require energy to run. The Krebs cycle is the second in the chain of cycles and also creates two ATP. The third stage is the electron transport chain or ECT for short. ECT occurs in the mitochondria and is also aerobic but unlike the other two it creates 32 ATP. After al these processes are through you have 36 ATP most of witch is used as heat energy. The equation for cellular respiration is C6H12O6+ 6O2= 6CO2 +6H2O. The process of cellular respiration is important to life because plants need animals to survive, they provide the plants with carbon dioxide and water that they need to live and animals also eat plants to get the sugar they need to use cellular respiration so it keeps the population of plants down so there is no competition between them. as you can see there are many differances between cellular resperation and photosythesis.
 * //__ Very clever I like it ↓ for the bottom one __//**