why does transpiration happen

• transpiration is the evaporation of water from a plants surface especially the leaves
• transpiration happens as a result of gas exchange
• a plant needs to open its stomata to let carbon dioxide in so that it can produce glucose ( by photosynthesis)
• when stomata does open it lets water out so then there's a higher water concentration inside the leaf then in the air so water moves the leaf and down the water potential gradient when stomata open
• transpiration

  
• water moves from areas of high water potential to areas of low water potential down a water potential gradient