Review the Plasmolysis
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Transcript of Review the Plasmolysis
Review the PlasmolysisPlasmolysis is the shrinkage of the cell contents due to the water loss when a drop of salt water is added to the red onion / Elodea slide. The water molecules
move out of the cell membrane causing the cell membrane and its contents to shrink into a blob in
the center of wall
Plasmolysis: Red OnionRED ONION DISTILLED WATER RED ONION SALT WATER
Plasmolysis: ElodeaELODEA : DISTILLED WATER ELODEA: SALT WATER
Plasmolysis: Questions1. Does the distilled water or salt water cause Elodea
cells to decrease in size? Why do the cells shrink?2. Why didn’t the salt from the outside just move
inside the cell instead of the water moving out of the cell?
What does this tell you about the cell membrane?3. What structure did the shrinking of the cell allow
you to observe?4. Why didn’t the cell wall shrink?5. Do you think it would be possible for Elodea to go
back to their original condition after shrinking ? Why?
Answers1. Does the distilled water or salt water cause
Elodea cells to decrease in size? Yes Why do the cells shrink? Higher salt concentration caused the diffusion of
more water from within the cell to outside the cell.2. Why didn’t the salt from the outside just move
inside the cell instead of the water moving out of the cell?
The cell membrane is selectively permeable.
What does this tell you about the cell membrane?
It allows the movement of water but not salt
Answers continue3. What structure did the shrinking of the cell allow
you to observe? cell wall
4. Why didn’t the cell wall shrink? It is rigid and provides support to the Elodea plant
cell. Also, it allows salt to go through so it does not shrink, unlike the cell membrane.
5. Do you think it would be possible for Elodea to go back to their original condition after shrinking? Yes
Why? When concentration changed- deplasmolysis would
occur.