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Introduction
Each group was assigned a salt concentration to test: 0%,.9%,5%,10%, and 15%.
Our group was 5% salinity.
The objective of this experiment was to measure the effect of osmosis on potato cylinders to represent how plant cells absorb water through osmosis. Osmosis, a type of diffusion, plays a vital role in stability and growth in plants. Cells have selectively permeable membranes that only allow the movement of specific solutes.Osmosis is the movement of water molecules through a selectively permeable membrane from higher water concentration to a lower water concentration - or - down a concentration gradient.
What do these results mean?
Water is moving out of the potato at 5% concentration. However at 0%, there is dynamic equilibrium. An equal amount of water is moving in and out of the cells.
The water in our potato cylinders moved from the cells of the potato into the solution because it had an area of lesser water potential.
"Salinity stress is a critical environmental constraint to crop productivity especially in arid and semiarid
regions. The most of the crop plants is intolerable to high salinity conditions resulting decreased yield.
Generally, plants are stressed in three ways in saline soils a) low water potential of the root medium leads
water deficit, b) the toxic effects of the Na+ and Cl -
and C) nutrient imbalance by depression in uptake and/or
shoot transport (Munns and Termaat 1986, Chapin 1991, Marschner 1995). "
Importance as Food
If the salt solutions had too much or too little solute, it could have changed the reaction of the potato cells. A more salty solution is, the more likely the water will move out of the potato. If the solutions were wrong, our data could be wrong.
If the initial weight or length of the potato was incorrectly measured, the amount of change is wrong, and therefore the calculations of the effect of salinity can be changed.
We did not monitor temperature.
Temperature can effect reactions and rates of reactions and processes.