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The effect of osmosis, diffusion, and the determination of osmotic concentration on potato parenchyma.

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Introduction

The effect of osmosis, diffusion, and the determination of osmotic concentration on potato parenchyma. Nicole Simone Dr. Kelly- Bio I Lab ABSTRACT I used the extract of a potato to observe the processes of osmosis and diffusion. I used a # 5 cork borer to cut the potato tuber cylinders from the potato. I cut the cylinders to be exactly 40 nm. I added a sucrose solution to the potato extract and incubated them for two hours. After the two hours were up the length was measured the potato extract weighed less. INTRODUCTION Diffusion is the movement of molecules from a high concentration to a low concentration. ...read more.

Middle

This accounts for osmosis. Osmosis is the diffusion of water through a membrane. Osmosis occurs because certain molecules cannot cross the membrane. Hypotonic refers to more molecules being outside the cell, water enters the cell, and the cell expands. Isotomic refers to the same concentration of molecules inside and outside of the cell. No osmosis takes places during this phase. Hypertonic is when more molecules are outside the cell than inside the cell, and water leaves the cell, hence the cell shrinking. When the volume of sucrose increases in the beaker the cells of the potato will shrink and become hypertonic because water will leave the cells to dilute the outside solution. ...read more.

Conclusion

Table 2 shows us the same things for the class data. DISCUSSION The osmotic concentration of the potato parenchyma for the table is 3.388. The osmotic concentration of the potato parenchyma for the class data is .0304. You were able to determine the osmotic concentration of the potato parenchyma by solving for X which is the osmotic concentration when you know Y, the percent change. My hypothesis was proved wrong after the two hours when we weighed the potato extract and saw that it did weigh less. As the volume of sucrose increases in the beaker, the cells of the potato will shrink and become hypertonic because water will leave the cells to dilute the outside solution. Water was absorbed out of the cell, hence making the cell weigh less. ...read more.

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