organising plants

• how does temperature effect transpiration?

  higher temperature increases the rate of transpiration
• why does temperature effect transpiration?

  water evaporates faster in higher temperature
• how does humidity effect transpiration?

  lower humidity increases the rate of transpiration
• why does humidity effect transpiration?

  the drier the air, the steeper the concentration gradient of water molecules between the air and leaf
• how does wind speed effect the transpiration?

  more wind increases the rate of transpiration
• why does wind speed effect transpiration?

  wind removes the water vapour quickly, maintaining a steep concentration gradient
• how does light intensity effect transpiration?

  higher light intensity increases the rate of transpiration
• why does light intensity effect transpiration?

  stomata open wider to let more carbon dioxide into the leaf for photosynthesis
• define the term transpiration


  movement of water from the roots to the leaves through the xylem
• give two purposes of transpiration

  1. provides water to cells for photosynthesis
  2. transports mineral ions to leaves