Study of Osmosis in Living Plant Tissue free essay sample

Objective: To study osmosis in living plant tissue. Biological principles: Water potential is the tendency for water molecules to enter or leave a system by osmosis through a differentially permeable membrane, while osmosis is the process in which water molecules move passively from a region of higher water potential to a region of lower water potential through a differentially permeable membrane. Therefore, potato cells, with their differentially permeable membrane, are selected as the medium for studying osmosis in this experiment.In this experiment, strips are cut from the same potato and placed in sucrose solutions with different concentrations to see if there are any changes in term of weight. Different concentration of sucrose solution is the independent variable while the volume and length of each potato strip and the amount of sucrose solution used are the control variables which should be kept constant. The dependent variable is the percentage change in weight of the potato strips. We will write a custom essay sample on Study of Osmosis in Living Plant Tissue or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page In addition, it is assumed that the nutrient content of the potato is evenly distributed and all the potato cells are fresh and alive.Apparatus and materials: Refer to the lab menu Procedure: Refer to lab menu Discussion: The potato strips put in distilled water became heavier. This was because distilled water was hypotonic to the potato tissue, so that there was a net movement of water into the cell by osmosis. The weight of potato strips put in 10% sucrose solution increased only slightly because 10% sucrose solution was also hypotonic to the potato tissue, however the water potential difference between the sucrose solution and potato tissue was small. The potato strips put in 20% sucrose solution was hypertonic to the potato tissue. Therefore, more water molecules leaving the tissue resulted in a net movement of water out of the cell by osmosis. The accuracy of the result might be reduced by the errors made during the experiment. For example, the impermeable potato skin might not be totally peeled off which reduced the surface area and hence the efficiency of osmosis taking place on the potato strips. Besides, evaporation of water from the beaker set-up decreased water potential of the solution. Moreover, the reading of the potato weight from the electronic balance might not be precise enough to show the small difference in weight between different strips.Several improvements can be made to reduce the influence of the errors. First, it should be ensured that all skin is peeled off from the potato before immersion. Secondary, a plastic food wrap should be used to cover the beaker in order to prevent water vapour from escaping from the set-up. Thirdly, for the error caused by electronic balance, it is suggested to use a more accurate balance with more decimal places so as to measure the weight more accurately. Conclusion: Living plant tissues are differentially permeable. When living plant tissues are placed in solutions with different water potential, osmosis takes place.

Classification and Division Essay Topics List

Classification and Division Essay Topics ListEvery student has their own set of classification and division essay topics to write about. Some students find class content very boring and prefer to write about more fun, exciting topics. Others want to write about subjects that will help them get a better grade on their exams. However, there are also students who prefer to write about topics that are outside of the content of the class and they don't like to go back to school to take an exam after they have written a very good essay.Before starting to research the topics for your essay, you should decide on a topic and a format to use for this traditional school essay topics list. This will allow you to know exactly what topic you will be writing about and can make it easier for you to write about it in a relaxed manner.When you start your research, you should find out what other topics students will be using and how they do it so that you can study what other students are doing. Anothe r thing that you should do is to determine what topics other students already know about and try to learn these. You should also decide on a topic before you start your research. Once you know what topic you will be writing about, you can choose from many different essay topics list.When looking for the right list of classification and division essay topics, you should make sure that the topic that you want to write about is easy to understand and that you can find references to the topic. If the topic is too difficult for you to understand, then you will most likely not be able to find a reference for the topic.On your assignment, you should make sure that you write the essay topics in a way that it is easy to understand and that you are able to understand the material. If you are able to find a reference for a topic, you should make sure that you use it in your essay. Once you are finished with your essay, you should make sure that you check and see if it is acceptable for a paper or if it needs to be rewritten. There are many things that you should avoid doing when you are writing your assignment so that you will be able to avoid any problems later on.Once you have completed your essay, it should be submitted to your teacher to make sure that it is accepted for the class. This will make sure that you have accomplished your assignment and will help you prepare for the next essay that you are going to write. Your teacher will also be able to determine whether or not you need to write a different essay for the next class that you will be taking.Writing a good essay is something that you should do every day. You should remember that you must write something that is appealing to your readers and that is not boring to read. If you do this, you will have a successful academic career.