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The effect of sugar concentration on potato tissue - Osmosis

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Introduction

The effect of sugar concentration on potato tissue Scientific Background Knowledge Osmosis Osmosis is very important in plant cells. !!!!!!!!!!!!!!!!!!!!!!!!!!! Osmosis is the passive movement of water molecules from an area of high concentration to an area of low concentration through a partially permeable membrane. In a plant cell, it is the cell membrane which acts as the partially permeable membrane. This is due to the small holes within it, which allow small molecules to pass through, but not large ones. The cell membrane separates the contents of the cell from the outside. During osmosis, water diffuses from the weaker solution (high water concentration) into the stronger solution (low water concentration.) ...read more.

Middle

If a plant cell is turgid it provides support for the plant, and is useful in the opening of stomatal guard cells during the process of transpiration. Flaccid Cells If a plant does not get enough water either because the plant is losing more water through transpiration than it is taking in through osmosis, or because the plant is losing water through osmosis, then the plant will begin to wilt. This stage is when the plant becomes FLACCID. If a plant cell is placed in a strong solution (low water concentration) then the water molecules will move from the cell vacuole which has a higher water concentration into the surrounding solution. ...read more.

Conclusion

Usually it results in the death of the cell. Potato Tissue Potatoes are made up of a bulky tissue structure. Similar to other plants, potato plants make glucose by the process of photosynthesis. This glucose is stored as starch in the stems and leaves, so it can be used when photosynthesis is not occurring. Glucose is stored as starch, as it does not bloat the storage cells as glucose would do due to osmosis. In particular the potato plant stores a large quantity of starch in its roots during the winter so that the plant can grow from the stored starch the following year. Humans eat this swollen root, and it is the root that we shall be using in our experiment. Sources I used: * The Revision Guide * Biology for You The Usbourne Illustrated Dictionary of Science Laura Smith 17/02/2005 ...read more.

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