factors effecting transpiration rate

• light intensity - the lighter it is the faster the transpiration rate

  • stomata open when its light so more transpiration
  • when its dark stomata are closed so there's little transpiration
• temperature - the higher the faster

  • warmer water molecules have more energy so evaporate from the cells inside the leaf faster
  • increases the water potential gradient between inside and outside the leaf, water diffuses out the leaf easier
• Humidity - the lower the faster the transpiration

  • if air around plant is dry the water potential gradient between leaf and the air is increased which increases transpiration rate
• wind - windier it is the faster the rate

  • lots of air movement blows away water molecules from around the stomata.
  • increase the water potential gradient which increases the amount of transpiration
• stomata are found on both sides of a leaf which reduces the amount of water lost through transpiration
• the waxy cuticle layer on top of the epidermis helps to reduce transpiration by reducing the surface area available for diffusion.