Osmosis CELL STRUCTURE AND TRANSPORT Flashcards
What does Turgid mean?
Swollen, specially due to high fluid content. It is essential in plant cells to make them keep standing upright.
What does plasmolysed mean?
The shrinking of protoplasm away from the cell wall of a plant or bacterium due to water loss from osmosis. It results in gaps between the cell wall and cell membrane.
What does Hypertonic mean?
A solution that is more concentrated that the cell contents.
What does Hypotonic mean?
A solution that is less concentrated than the cell contents.
What does Isotonic mean?
A solution that is the same concentration as the cell contents.
What is Osmosis?
The overall net movement of water through a partially permeable membrane from a dilute solution (which has a high concentration of water) down a concentration gradient.
Why does a plant cell not explode during Osmosis?
The cellulose in the cell wall is very strong. It takes in the water.
What is a dilute solution?
A solution of sugar contains w high concentration of water. It has a low concentration of sugar.
What is a concentrated solution?
A sugar solution contains a relatively low concentration of water and a high concentration of sugar.
What will happen if the solution outside a cell becomes hypotonic (more diluted) than the cell contents? Water will move in by osmosis. The cell will swell and may burst.
Water will move in by osmosis. The cell will swell and may burst.
What happens if the solution outside the cell becomes hypertonic (more concentrated) than the contents of the cell?
Water will move out.
Why do plants rely on osmosis?
To support their stems and leaves. Water moves into the cell by osmosis, causing he vacuole to swell, which presses the cytoplasm against the plant cell wall. The pr sure builds up until no more water can enter the cell. This is when the cell becomes turgid. This makes the cell hard and rigid, which keeps the leaves and stems of the plant firm.
