Leaves

• Name and describe three adaptation of a leaf that allow efficient gas exchange

  Thin and flat - short diffusion pathway and large SA:V

  Many stomata under leaf - easy access for gases to enter

  Air spaces in mesophyll - gases can move around the leaf to facilitate photosynthesis
• How do plants limit their water loss while still allowing gases to be exchanged?

  Stomata regulated by guard cells - open or close when needed

  Most stay closed to prevent water loss but some stay open to let CO2/oxygen in