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10 Cards in this Set
- Front
- Back
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What is adhesion? |
Water sticks to walls |
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What is cohesion? |
Water sticks to other water molecules |
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How does the cohesion-tension theory work? |
Water molecules are linked through the cohesive forces of h bonds. When water evaporates from cells the rest of the water in the chain is pulled into the cell by osmosis - pull top one up pulls rest up |
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How do you change the date of transpiration? |
Open stomata - more evaporation - more water loss = higher rate of transpiration Closed stomata - less evaporation - less water loss = lower rate of transpiration |
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How do stomata open? |
If water flows into the guard cells they become turgid and open stomata |
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How do stomata close? |
If water moves out of guard cells they become flavor and close |
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how does humidity affect rate of transpiration? |
High humidity = lie rate of transpiration bc water in the air creates a low concentration gradient so water vapour is unable to evaporate of the surface of the leaves |
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How does air movement affect the rate of transpiration? |
Fast air movement carries water off the plant (increases transpiration) and the plants lose more water |
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What else affects the rate of transpiration? |
Temperature Soil water availability Light intensity |
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How does a potometer work? |
Blow a bubble and time how long it takes to move through the tube = speed of transpiration |
