osmosis Flashcards
(23 cards)
What is osmosis?
The diffusion of water molecules from a region of higher concentration to a region of lower concentration through a partially permeable membrane.
What does a dilute solution contain?
A high concentration of water molecules.
What does a concentrated solution contain?
A low concentration of water molecules.
What is the main focus of osmosis?
The movement of water molecules only.
What happens when the concentration of water is the same on both sides of a membrane?
There will be no net movement of water molecules.
What type of membrane do cells have that relates to osmosis?
Partially permeable cell membrane.
What do plant cells do when placed in a dilute solution or water?
Take in water by osmosis.
What is a characteristic of plant cells regarding their structure?
They have a strong cellulose cell wall.
What happens to plant cells in pure water?
They become turgid and swollen.
What happens to plant cells in a concentrated solution?
They become smaller and weaker, due to osmosis moving the water from the plants into the solution.
What is plasmolysis in plant cells?
The process where cells lose water and shrink away from the cell wall.
How do animal cells respond to osmosis?
They change size and shape, as they do not have a cell wall.
What can happen to red blood cells in a more dilute solution?
They can gain water, swell, and burst.
What is the importance of maintaining concentration of body fluids in animals?
To ensure cells function efficiently.
Fill in the blank: Osmosis is the diffusion of water through a _______.
partially permeable membrane.
True or False: Osmosis only involves the movement of solute molecules.
False.
List three substances that cells contain in dilute solutions.
- Ions
- Sugars
- Amino acids
What happens to plant cells in drought conditions?
They lose water by osmosis.
What is the role of the cell wall in plant cells during osmosis?
It supports the cell and prevents bursting when gaining water.
Fill in the blank: In a very concentrated solution, cells undergo full _______.
plasmolysis.
What is the effect of osmosis on aquatic plants placed in seawater?
They lose water by osmosis.
What must be kept within strict limits in animals to maintain cell function?
The concentration of body fluids, such as blood plasma and tissue fluid.
What does plasmolysis mean?
The propast of a plant shrinking, due to water loss
