Osmosis potato lab ap bio

Potato osmosis lab worksheet answers

Negative water potential is called tension. Hypothesis: Osmosis and diffusion will continue until dynamic equilibrium is reached and net movement will no longer occur. Plasmolysis is a phenomenon in walled plant cells in which the cytoplasm shrivels and the plasma membrane pulls away from the cell wall when the cell loses water to a hypertonic environment. Be sure to watch students closely at the beginning. Without this water there is little pressure inside the cells and the plant can no longer support itself against the pull of gravity. Not enough experiments Conduct the experiment with different independent adapting 6 different variables. The independent variable in this experiment is the sugar concentrations in the colored solutions and the dependent variable is the difference in weights of the potato cores from the weight before the experiment and after the cores have soaked in their respected colored solutions. Fill the graduated cylinder with tap water two-thirds of the way up. Advise students to tie the string very tight. Reliability: Generally the method seems to work well to get suitable results but parts of it were not reliable. You can also estimate what percentage of a potato core is water based on your data. Place one potato core in the beaker with distilled water and label this beaker "".

Reweigh, and record the mass. Knowing whether or not water flowed into or out of the potato will give you an idea of approximately what percentage of a potato is water.

osmosis experiment with potato and sugar solution pdf

This leads to a loss of turgor pressure the force directed against a cell wall after the influx of water and the swelling of a walled cell due to osmosis and eventual death of the plant.

Compare the results with another group. Water potential measures the tendency of water to leave one place in favor of another place.

osmosis experiment with potato and sugar solution

Divide your 24 cores into 6 groups and gently blot them dry with a paper towel 5. Introduction: All cells have membranes that are selectively permeable.

Osmosis potato experiment salt solution results

Lab Procedure Our lab procedure was to take five equal potato core pieces similar in weight and place each in a different beaker which has the five different sugar solutions. Exercise 1D First, determine the solute potential of the glucose solution, the pressure potential, and the water potential. Since the apple was not fully submerged and was much thicker, it took longer fo the vinager to diffuse through the gel and react with the solution and turn it clear. We extracted 5 relatively small samples from the potato. Hypothesis: The more hypertonic potato cores are to sucrose solution, the more weight potato cores gain. Then, we simply watched the effect it had on the cells under a microscope. Which solutions if any were hypertonic, isotonic, or hypotonic? Exercise 1C This part of the experiment requires a large potato, potato corer about 3 cm long , ml beaker, paper towels, scale, six cups, knife, paper, pencil and about ml of each of these solutions: distilled water, 0. We created microscope slides containing thin layer of onion root cells. Fold the aluminum foil down along the sides of the beaker so that it cannot fall off easily. However, once again, shown in the graph, there was a mistake in either measuring or reading. Obtain 24 potato cores and cut them to equal sizes about 2. This basically means that this compound is an acid base indicator. Use glucose tap to test for any glucose in the water.

My class periods are 50 minutes long, so minutes is usually the longest we can keep them soaking. Record the color change of the tape and the color of the bag.

osmosis in potatoes lab report

Pressure potential is usually positive in living cells and negative in dead ones. It is necessary to leave space for expansion but no air. You can order laboratory grade sucrose or just use table sugar. Since the apple was not fully submerged and was much thicker, it took longer fo the vinager to diffuse through the gel and react with the solution and turn it clear.

Potato osmosis experiment method

The beakers contain distilled water. Hypothesis: The more hypertonic potato cores are to sucrose solution, the more weight potato cores gain. The water potential of pure water at atmospheric pressure is defined as being zero. Agar is a type of gelatin that contains a chemical known as Phenothayline. Allow the beakers to sit for a day. Cover the top of each beaker with a piece of aluminum foil. This basically means that this compound is an acid base indicator. Diffusion and osmosis are not the only processes responsible for the movement of ions or molecules in an out of cells. Exercise 1A For this exercise, the following materials are required: a 30 cm of 2. We put three potato cores in beaker; there were six beakers in all. Record the color change. Fill the graduated cylinder with tap water two-thirds of the way up.

The first experiment was the potato core lab.

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(DOC) Biology: Osmosis and Diffusion Lab using Potato Cores