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Description
Flashcards by Dani O'Rourke, updated more than 1 year ago
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Created by Dani O'Rourke
over 10 years ago
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| Question | Answer |
| Diffusion is the spread of liquid or gas particles from an area of high to low concentration, until there is an even distribution. e.g. spraying Impulse |
Image:
Diffusion (image/png)
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| Osmosis is a type of diffusion where water molecules move from an area of high water concentration (dilute solution) to low water concentration across a semi permeable membrane, until it is Isotonic (equal concentrations) |
Image:
osmosis3.gif (image/gif)
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| CASE ONE: ANIMAL CELL If an animal cell is placed into a beaker of distilled water (100% water), osmosis occurs here because.. | ..there is more water outside the cell in the beaker, than inside the cell (99.1%). Water moves through the Selectively Permeable cell membrane. As a result, the cytoplasm gets larger and the cell membrane may burst - called Lysis |
| CASE TWO: ANIMAL CELL If an animal cell which contains 99.1% water is put in a solution with 98%, osmosis will occur because.. | ..there is more water inside the cell (99.1%) than outside (98%). Water moves across the Semi Permeable cell membrane to the outside. As a result, the cytoplasm loses water and the cell shrivels - called Crenation |
| CASE THREE: ANIMAL CELL If an animal cell which is 99.1% water is placed in a solution which is 99.1% water, osmosis will NOT occur because.. | ..there is an equal amount of water on both sides of the cell membrane - called Isotonic |
| Passive Transport: the movement of particles from more to less, down a concentration gradient, i.e. no energy needed. e.g. osmosis and diffusion | Active Transport: the movement of particles from less to more, up a concentration gradient, i.e. energy is need. e.g. uptake of minerals by roots of a plant from the soil |
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