Factors affecting transpiration rate
- Created by: Remya Salimkumar
- Created on: 30-04-15 10:46
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- FACTORS THAT AFFECT TRANSPIRATION RATE
- Number and size of leaves
- more leaves= larger surface area for water to be lost from
- Number, size and position of stomata
- Many, large stomata= more water loss
- Stomata on lower surface= slower rate of loss
- Presence of cuticle
- waxy- prevent water loss from leaf surface
- Light
- Stomata open for gas exchange for photosynthesis
- Temperature
- higher temperauture= higher rate of loss
- increases rate of evaporation
- increase rate of diffusion due to more kinetic energy
- decrease relative water potential in air
- higher temperauture= higher rate of loss
- Relative humidity
- Higher relative humidity in air decreases rate of loss
- water moves down potential gradient
- Higher relative humidity in air decreases rate of loss
- Air movement/ wind
- air movement will carry water vapour from surface
- maintains water potential gradient
- air movement will carry water vapour from surface
- Water availability
- little water in leaves= plants cannot replace water loss
- water loss reduced by closing stomata or shedding leaves
- little water in leaves= plants cannot replace water loss
- Number and size of leaves
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