Diffusion and Osmosis Essay Example for Free

Diffusion and Osmosis EssayDiffusion and osmosis are very important in biological process. Diffusion is the movement of molecules or ions from a region of their high concentration to a region of their low concentration. Osmosis is the diffusion of water molecules across a semipermeable membrane. To gain a better understanding of diffusion and osmosis, we examine multiple experiments to leaven diffusion and osmosis in animal cell, plant cell and celluloid cell. In our first experiment, we metric weight unit a decalcified chicken addict and place 10% NaCl concentration. At any fifteen legal proceeding intervals, we weight the egg and record that the weight decreases. In our second experiment, we use cardinal slices of aquatic plant pondweed and add puddle water champion leaf, distilled water for the second and 20% NaCl for the third, whence let out the cells of each leaf with a compound microscope.Under microscope, chloroplasts (green organelles) in Elodea tend to bo und to the cell wall in pond water, spread all over the cell in distilled water, pull away from cell wall in 20% NaCl. In our last experiment, we use a dialysis pop that contains 30% glucose and starch ancestor then place into a beaker of water and iodine solution. We then remove the purse out of the beaker, and use deuce test provide which label BAG, BEAKER to transact a Benedicts test. We place solution in the bag in the BAG tube, and solution in the beaker in the BEAKER tube and add a drop of Benedicts reagent to each tube, then heat each test tube and observe a color shift in each tube. These experiments show that movement of water of chicken egg cell and Elodea cell is osmosis and movement of molecules in dialysis bag and beaker is diffusion.INTRODUCTIONDiffusion is involved in many biological processes occurring in single-celled to complex organism (cite this). It is a part in manners that we need to know and understand how it works. Diffusion is the process by which mo lecules move from an area of high concentration to an area of low concentration (cite this). A divide of diffusion process is osmosis, which is the movement of water across a membrane which is selectively permeable (cite this). We are going to learn and get more development about diffusion osmosis by perform three experiments. We place a shell-less chicken egg in salt solution. We address that water in the egg will move out the cell because this is a hypertonic solution, a greater concentration of osmotically active substance than the solution on the otherwise side of membrane.Next, we are going keep back three slices of Elodea in each different solution hypotonic, isotonic, hypertonic then we observe these reactions in the microscope. We predict that one will have chloroplasts (green organelles) bound to cell wall in hypotonic, one will have chloroplasts move in the cytoplasm, one will have cell wall remain intact and chloroplasts move away from cell wall. Third, were going to use a dialysis bag contains starch and glucose and place in water and iodine solution. After a Benedict test, we predict that there will be color change in these solutions. These experiments are easy to perform and they also give people enough information to gain better concepts of how diffusion works in animal cell, plant cell, and celluloid cell.METHODSFirst, we performed an experiment to show osmosis in animal cell. Our materials in this experiment were a decalcified egg, a 350mL beaker, 10% of NaCl solution, a triple beam remnant, and a timer. We used the triple beam balance to weigh the egg. The weight of the egg was 77.3g at this time. Next, we situated the egg in the beaker that was filled with 250mL of 10% NaCl. We waited about fifteen minutes and then remove the egg out of the beaker. We dried off the water from the egg and dictated the egg on the triple beam balance. The weight of the egg after fifteen minutes was 76.6g. We then placed the egg back in the beaker and r epeated these steps every fifteen minutes intervals. At xxx minutes, the eggs weight was 76.3g. At forty-five minutes, the weight was 76.2g. At sixty minutes, the weight was 76.1g. We recorded the data and calculated the percent change in egg weight by using the weight at the present time minus the previous weight all over the previous time and all multiply to one hundred. We then graphed our data to show percent changes in weight of the egg.Next, we performed another experiment to show osmosis in a plant cell. We used leaf of the aquatic plant Elodea, pond water, distilled water, 20% NaCl solution, a compound microscope, a pair of forceps. First, we cut three micro pieces from Elodea plant with forceps. We then carefully placed each piece onto the microscope slide glass. We added a small drop of pond water to one piece and labeled it pond water. We added a small drop of distilled water to another piece and labeled it distilled water. Last we added 20% NaCl to the last piece and l abeled it 20% NaCl. We waited for ten minutes and then we observe the cells of each piece of leaf under the microscope. We then sketched the cells of each piece as seen in the microscope. In our last experiment of diffusion of synthetic cell, we used a 30-cm strip of moist dialysis tubing, a string, 30 % glucose solution, starch solution, iodine solution, Benedicts reagent, hot plate, 500-mL beaker one-third filled with water, handled test tube holder, 3 standard test tubes, disposable transfer pipettes, deuce of 400-mL beakers to hold dialysis bag.First, we soaked the dialysis tubing in water and closed one end with a string, and let the other end open. Then we added four pipettesful of 30% glucose into the bag and four pipettesful of starch solution to the glucose in the bag. We gently mixed the contents and observed the color in the bag. Next, we add 300mL of water to 500mL beaker. We put some drops of iodine solution in the water and it turned into a brown color. After that, we placed the dialysis bag into the beaker and waited for thirty minutes. After thirty minutes, we moved the bag and let it stand in a dry beaker. We then recorded the data. Next, we used two test tube which labeled BEAKER and BAG for the Benedicts test. We put two pipettesful of the bag solution in the BAG tube and two pipettesful of the beaker solution in the BEAKER tube. We added a drop of benedicts reagent to each tube and heat them up in hot water for three minutes. After three minutes, we observed the color change and recorded our data.RESULTSIn our first experiment with decalcified egg in 10% NaCl, we suffer that the weight of the shell-less egg decreases after every fifteen minutes time interval. At time zero, the egg has 77.3g but after fifteen minutes, the egg has 76.6, a -0.9% change in weight. At thirty minutes, the egg has 76.3g, a -0.4% change in weight. At forty-five minutes, the egg has 76.2g, a -0.1% change in weight. At sixty minutes, the egg has 76.1g, a -0.1% chan ge in weight.In our second experiment with Elodea plant, we find that chloroplasts(green organelles) of Elodea cell in pond water moves close to cell wall. In distilled water, we find that chloroplasts (green organelles) of Elodea cell move freely through out in the cytoplasm but block by cell wall. We also find that chloroplasts (green organelles) of Elodea cell of in 20% NaCl moving away from the cell wall and form tightly in the central of cytoplasm. In our last experiment with dialysis tubing, we observe some color change. The bag solution, which contains glucose and starch, has a transparent original color, turns to transparent with some black dots as final color. After using the Benedicts reagent, the tube which contains the bag solution turns into an orange color.