Transpiration rate

Cards (5)

what are the 4 main factors which affect transpiration rate?
Light
Temperature
Humidity
Wind
How does light affect transpiration rate?
lighter = faster rate
Positive correlation
Because the stomata open when it gets light to let in CO2 for photosynthesis
Dark = stomata usually closed- so little transpiration
How does temperature affect transpiration rate?
Higher temp = faster rate
Warmer water molecules have more energy so they evaporate from the cells inside the leaf faster. = increases conc gradient between inside and outside of leaf - making water diffuse out of the leaf faster
How does humidity affect transpiration rate?
Lower humidity = faster rate
Negative correlation
If air around plant is dry = conc gradient between the leaf and the air is increased = increases transpiration
How does wind affect transpiration rate?
Windier = faster rate
Lots of air movement blows away water molecules from around the stomata = increases conc gradient = increases rate