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Definition
| allowing only certain materials to pass through |
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| allowing all materials to pass through |
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| allowing no materials to pass through |
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| the movement of particles in liquids and gases from an area of higher concentration to an area of lower concentration |
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| How does diffusion relate to the cells with the particle model |
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All particles are constantly moving and bumping into each other.
If ink was put into a liquid like water as they all bumped into each other the ink particles would move to areas with fewer particles. |
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| How do cells use diffusion |
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Definition
| DIffusion in cells is used to equal out the carbon dioxide inside and out of the cell. When the cell produces carbon dioxide as a waste product the amount of carbon inside is unequal to that of inside. The cell must use diffusion and allow some carbon dioxide particles leave the cell through tiny holes to equal out. |
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| the diffusion of a solvent, usually water, through a selectively permeable membrane |
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| How does your body use and need osmosis |
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| About 70 percent of the cell is water and most will die without it. When you are active and you sweat water is lost from those cells. Water tends to move by osmosis from a diluted solution to a more concentrated solution so other parts of your body gives that part the needed water (partly by osmosis and partly by the circulatory system) . |
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| in plants, tissues that connect the root system and the shoot system |
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| in plants, the tissue that conducts water and minerals absorbed by the root cells to every cell in the plant |
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| in plants, the tissue that transports sugars manufactured in the leaves to the rest of the plant |
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| On a plant root, an extension of a single epidermal cell. Water enters a root hair by osmosis |
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| small holes on the underside of leaves allowing air and carbon dioxide to enter and exit. |
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| the loss of water from a plant through evaporation |
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| What happens to water that is not needed when it reaches the top of the plant. |
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| Water from a plant does not circulate and goes back to the roots. It must exit the plant through transpiration |
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| How are plant cells connected |
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| There is no break in this water system. Fine columns of water connect every cell, from the leaves to the roots. |
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| How does water go from the top of the tree (use particle model as well) |
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Definition
| The particle model states that individual water particles are held together by attraction, the water would then behave as a single unit. Water from root hairs pushes water columns up the plant. At the same time, water lost from the leaves by transpiration pulls water up the xylem tissues all the way from the roots. Because of this, trees can transport water without having a pumping organ similar to the human heart. |
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