Investigating Osmosis Coursework For Biology Includes Prediction Evaluation And Results

1078 words - 4 pages

PredictionOsmosis is defined as ¡§the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration¡¨.In a high concentration of water the amount of solute (e.g. sugar) is low. This could be called a weak or dilute solution. In a low concentration of water the amount of solute (e.g. sucrose) is high. This could be called a strong or concentrated solution. When two such solutions are divided by a semi-permeable membrane the water will move from the area of high concentration to the area of low concentration, until both sides are equal (have reached equilibrium).Knowing that osmosis will occur across a semi-permeable membrane whenever there is a difference between the water concentrations on the two sides of the membrane, and knowing that when this happens to cells they will either become turgid if water flows into them, or plasmolysed if water flows out of them, and thus change their volume, we want to test the hypothesis that:If the concentration of a solution into which a cylinder of potato is placed is greater than a certain level the cylinder will contract, and if the concentration is less than that level it will expand. This can be seen in living cells. The cell membrane in cells is semi-permeable and the vacuole contains a sugar/salt solution. So when a cell is placed in distilled water (high water concentration) water will move across the semi-permeable membrane into the cell (lower water concentration) by osmosis, making the cell swell. This cell is now referred to as turgid. If done with potato cells the cells would increase in length volume and mass because of the extra water. If these potato cells were placed in a solution with a low water concentration, then the opposite would happen. Water would move out of the cell into the solution. In extreme cases the cell membrane breaks away from the cell wall and the cell is referred to as plasmolysed. The potato cells will have decreased in length, volume and mass.The greater the concentration of water in the external solution the greater the amount of water that enters the cell by osmosis. The smaller the concentration of water in the external solution the greater the amount of water that leaves the cell.However, there will be a point where the concentrations of water inside and outside the potato cells are equal (isotonic). At this point there will be no change in the length, volume and mass of the potato, as the net movement of water will be zero, no osmosis has occurred.Using this information a graph and prediction can be made:At point A the graph suggests that no osmosis has occurred, suggesting that the concentration of water inside the cell is equal to the solution outside.At point B (high water concentration), there is no indication that the cell is increasing further in size. This is because the cell is fully turgid and no more water can enter.At point C (low water...

Find Another Essay On Investigating osmosis - coursework for biology includes prediction evaluation and results

The Process of Osmosis and Diffusion in Dialysis Tubing - Biology - Scientific Report

1925 words - 8 pages represent an accurate reading of osmosis and diffusion. The concentrations of the solution being used will affect the result because if you were to do the same experiment with different concentrations, the results would be different as the concentration is a correlating variable. 2.1 Clearly outline the method used to carry out the chosen experiment: 1. Set up four 100mL cylinders 2. Set up the first 100mL cylinder with 10mL of water and

Biology experiment on osmosis for gcse very good got an A* as course work so do not miss out

3762 words - 15 pages that will seriously shrink. The plasmolysed plant cell can be seen under a microscope.My prediction for this particular investigation is at about 0.4 / 0.6 [molar] concentration the salt solution there will be an increase in both mass and length of the potato. The weaker the salt solution the further the solution the quicker will cause decrease in mass and length in the potato. To examine and create an appropriate range of results. For this

A Medical Information Recommender System for Disease Prediction and its Treatment

1834 words - 8 pages of symptoms based on their severity and importance and using this knowledge to calculate a numerical value to identify diseases. The future work can focus on using the medical history of the user with current symptoms in prediction of diseases. The test results for various medical conditions can be used to further improve the reliability of the system. One more novel thing that can be added is medicine prediction for the patient. abbrv

A critique of the article "Psychosocial evaluation and prediction of compliance problems and morbidity after heart transplantation", written by Shapiro et al

1736 words - 7 pages In the journal article "Psychosocial evaluation and prediction of compliance problems and morbidity after heart transplantation", the authors attempt to answer the question of whether preoperative psychosocial evaluations have reliable predictive value for heart transplant outcomes (Shapiro et al., 1995). Organ transplant programs use differing selection criteria and screening procedures to establish which patients are within established risk

QSTR modeling for qualitative and quantitative toxicity prediction of diverse chemical pesticides in honey bee for regulatory purpose

2668 words - 11 pages relational databases, and the role of the isscan database on assessing chemical carcinogenicity. Ann. Ist. Super. Sanità. 44, 48-56. Brock, W.A., Dechert, W., Scheinkman, J.A., LeBaron, B., 1996. A Test for independence Based on the Correlation Dimension. Economet. Rev. 15, 197-235. Cheng, F-X., Shen, J., Li, W-H., Lee, P.W., Yun, T., 2010. In silico prediction of terrestrial and aquatic toxicities for organic chemicals. Chin. J. Pestic

QSTR modeling for qualitative and quantitative toxicity prediction of diverse chemical pesticides in honey bee for regulatory purpose

2506 words - 11 pages % - 77.08 % and 74.47 %- 85.94 %, respectively. The results indicate that the toxicity prediction accuracies of both the QSTR models are comparable in two and four-category classification. The results have also shown no obvious over-fitting of the data. The Y-randomization tests were performed both for the two- and four-category classification of pesticides using 5-fold CV procedure. Average values of misclassification rate in two- and four category

Biology Practical to study the Osmosis effects of Sucrose solutions of different Molarities upon Plant Cells (Chinese Radish and Potato Chips)

6662 words - 27 pages differently permeable, different results are expected from the Chinese radish and potato chips in the same conditions; this is one reason for having two types of plant cell and not one. Another reason is that the two types of plant cells results can be compared and the similarities between certain results compared.The results taken during the experiment can be used to work out information that will help further our understanding of how osmosis takes

Biology notes about DNA's roll in a cell and how it is fitted in. Also includes plenty imformation on Chromosomes

749 words - 3 pages humans, gametes - egg cells and sperm cells - are haploid. A haploid cell contains only one homologue of each chromosome. The fusion of two haploid gametes forms a diploid zygote. A zygote is a fertilized egg cell, the first cell of a new individual. Being haploid ensures that when an egg and a sperm fuse, the resulting zygote will contain the characteristic diploid number of chromosomes for that organism.In most cases, humans who are missing

Feedback and Evaluation for a Federal Program

818 words - 4 pages the parent or student and will offer large loan amounts with no payments until after graduation, but will start to accrue interest immediately. This has become a burden for college students due to the interest being high on the loans and experiencing high payments for repaying the loan. How the Program has Been Changed as a Result of the Evaluation Students who desire to repay their loans, but are not able to make minimum payments due to

AP Biology Lab Report for Population Genetics and Microbiology

2632 words - 11 pages microevolution known as population genetics. The students first predicted the result of each of the 6 cases. The data was found using a program called PopCycle (Herron 2002), which picked genotypes randomly, and showed the results after particular conditions were entered. Students took these numbers and visually displayed them in charts. They configured the predicted amount of adults for each genotype by using the Hardy-Weinberg mathematical

Drama unit 2 coursework portfolio. it covers all the areas of study for homelessness and refugees

1948 words - 8 pages Drama Coursework- Unit 2.For my portfolio unit 2 i shall be writing about homelessness and refugees.Area of Study 1- Character & Context.One example of characters taken from real life was a young male refugee called Adriatik. His life started out normally as a school boy in his homeland and then it changed for the worst. Firstly his school closed down, and he was involved in a protest against the closure of his school. He was arrested and

Similar Essays

Biology Coursework: The Effects Of Osmosis On A Potato Chip In Sugar Solution

803 words - 3 pages Biology Coursework: Effect of Sugar Solution on Potato ChipsPlanningBefore planning the experiment, I will research osmosis, so that I can make predictions. This will help me to discover how to make this investigation fair and safe. Planning ahead will help me find out the order in which to carry out the experiment. This should lead me to good results at the end of the experiment.HypothesisOsmosis is the passage of water from a region of high

Disappearing X Experiment. Coursework About Sodium Thiosulphate And Hydrochloric Acid. Method, Results, Fair Testing, Evaluation Included. Was Marked With A Passing Grade

686 words - 3 pages how long it took for the solution to turn cloudy so that the cross could no longer be seen. We then decided to change the experiment to see if the concentration of the acid affected the rate of reaction. To do this we added water to the acid and did the experiment again 4 times, decreasing the concentration of the acid by 5cm3 each time. We did this by measuring out the acid in a beaker and pouring it into a measuring cylinder along with the water

Lab Report For Osmosis In Potato Strips Biology Repot

815 words - 4 pages grade biology class average will be on standardized memory tests. • Explain why you made your prediction based on scientific understanding • you can use the concepts covered in class / articles from Internet / real life experience to back up your proposed hypothesis Material and Apparatus / Equipment • Material (including chemical reagent) • make a detailed list of all required materials to be used in the lab • include specific quantity and

Evaluation Of Classification Algorithms Using Mcdm Methods For Financial Risk Prediction

845 words - 4 pages Proposed work of this paper includes Bayesian Network,Naïve Bayes, LIB SVM, Logistic Regression,Nearest Neighbor GE, RBF Network,Random Forest,and Simple CART. All algorithms are implemented using WEKA 3.7. 3.1. Evaluation Measures Different measures/criteria’s are available to measure the performance of classification algorithms [3]. Some classification algorithms achieve the best for one criterion may not be the best for some other criteria