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Topic 3

Mass transport in plants Transpiration

QuestionAnswer
Factors affecting Transpiration Light Humidity Tempreature Wind
Light intensity Posotive corrolation More light causes more stomata to open so larger surface area for evaporation
Tempreature Posotive corrolation More heat means more kinetic energy faster moving molecules and therefore more evaporation
Humidity Negative correlation More water vapour in the air will make the water more posotive outside of the leaf therefore reduces water potential gradient
Wind Positive correlation More wind will blow away humid air containing water vapour therefore maintaining the water potenital gradient
Movement of water up the xylem 1- Water evapourates out of the stomata on leaves. This loss in water volume creates a lower pressure
Stage 2 When this water is lost by transpiration more water is pulled up to the xylem to replace it
Stage 3 Due to hydrogen bonds between water molecules they are cohesive (stuck together). This creates a column of water within the xylem
Stage 4 Water molecules also adhere to the walls of the xylem. This helps to pull the water column upwards
Stage 5 As this column of water is pulled up the xylem it creates tension pulling the xylem in to become narrower
Created by: yHya
 

 



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