onion cells in sucrose essay

of different concentrations. The plamolysis of onion skin was tested under water, 0.3M sucrose, and 2.0M sucrose. The water was hypotonic to the onion cells causing the cells to become larger and less pigmented. The sucrose was hypertonic to the cells leading to osmosis and the cells to become shriveled and more pigmented as the color was left in the cells. Observed from the experiment, the higher the concentration of the sucrose the smaller the cells became. Rat blood was tested in different solutions

different solutions with various sucrose concentration influenced osmosis in relation to three onion cells and the impact on the cells structure. A small square of a red onion skin (membrane) was observed under a microscope at high power (X40) magnification. The observation showed a large number of onion cells. The structure of one onion cell had a general rectangular shape with a developed cell wall, which gives the rectangular shape to the cell and a cell membrane just beneath it. The

isotonic solutions on plant and animal cells. Materials and Apparatus: * Microscope * Electronic balance * Stirring rod * Small knife * Glass slide and cover * 250, 500 ml beakers * Distilled water * Cotton * Test tubes * Spatula * Onion * Ethanol (70%) * Filter paper * Table sugar (sucrose) * Table salt (NaCl) * Potato EXPERIMENT 1 PART 1 Procedure: 1. The epidermal layer of an onion is scaled off carefully and placed on

Practical Work Nº2: “Different methods to control osmosis” Aim: observe and test the process of osmosis through different kinds of methods: the weigh (potato), the density (beetroot) and under the light microscope (onion). Hypothesis: according to the encyclopedia definition osmosis is the diffusion of a liquid (most often assumed to be water, but it can be any liquid solvent) through a partially-permeable membrane from a region of high solvent potential to a region of low solvent potential. Thus

Results The control group’s rate of change remained at a consistent at no rate of change. The 20% and 40% concentrations of sucrose in the dialysis bags had consistent rates of change in mass over 30 minutes while the 60% concentrations of sucrose in the dialysis bag did not have a consistent change. The dialysis bag with 60% concentrations of sucrose in the beaker of water had a consistent change of rate through osmosis. The rate of change for the control, or Bag 1, was 0 g/min. Bag 2 and 5 had

diffusion bags, with a few distinct concentrations of sucrose. Last, you will

Abstract: This experiment discusses the effects that saline and non-saline environments have on potato strips. Two potato strips were cut to lengths of 2 inches and each strip was placed in one of two solutions. The solutions used were a.) a mixture of 24ml tap water and 1tsp salt and b.) 24ml tap water. This experiment was conducted over a period of five days and observations to each container were made daily at the same time. The experiment was set up to test the hypothesis that a saline solution

membranes and how these processes affect water potential. Students will also calculate water potential of plant cells. EDVOTEK, Inc. • 1-800-EDVOTEK • www.edvotek.com EVT 080423AM 2 AP Biology EDVO-Kit # 281 Principles & Practice of Diffusion and Osmosis Table of Contents Lab # 1

BIOL 140 Lab—The Chemical Composition of Cells Name ____________________________ I) Introduction All cells contain four major types of macromolecules: carbohydrates, lipids, nucleic acids, and proteins. In today’s lab, we will be studying three of the four-proteins, carbohydrates and lipids. Various chemical tests can be used to detect the presence of each of these molecules. Most of the tests involve a color change visible to the eye. If a color change is observed, the test is considered positive

of osmosis in a solution-submerged cell, only the amount of the solute in the solution will affect osmosis. To test this, we used three different sized solutes—sucrose, glucose, and NaCl—to see if the size of the solute had an effect on the osmosis of water into or out of white potato cells that were submerged in solutions containing the 3 solutes. We found that the size of the particles of solute does not affect osmosis of water into or out of the potato cells, only the amount of particles present