Transpiration
- Created by: Jasmin
- Created on: 29-04-13 20:00
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- Transpiration
- Loss of water from plant
- Water loss from leaves
- Stomata opened and closed by guard cells that surround them
- Open stomata - CO2 in photosynthesis
- When open - plants lose water - evaporation
- Shortage of water in leaf, more water pulled up by xylem to replace
- More water drawn up from roots to leaves - constant transpiration stream
- Effect of environment on transpiration
- High rate photosynthesis, high rate transpiration - more stomata opened up to let CO2 in - more water lost
- Warm sunny, hot, dry, windy conditions increase rate transpiration
- Controlling water loss
- Waxy cuticle - leaves
- Hot environments cuticle must be thick and shiny
- Too much water lost fast - wilting - leaves collapse and hang down
- SA for water loss/evaporation less
- Stomata close - stops photosynthesis, plant remain wilted until temp decreases
- Potometer - how uptake of water by plant changes with different conditions
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