transpiration and stomata

Cards (8)

  • what controls he opening of the stomata?

    guard cells - they open the stomata when turgid and close stomata when flaccid
  • what affects transpiration rate?
    • light intensity
    • temperature
    • air flow
    • humidity
  • how might temperature affect the rate of transpiration?

    it will cause an increase as water molecules have more energy o evaporate and diffuse out of the stomata
  • why might light intensity affect transpiration rate?

    brighter the light = greater the transpiration rate, stomata closes as it gets darker meaning photosynthesis can't happen so co2 doesn't need to be let in. therefore very little water can escape
  • what shape are guard cells?
    kidney shape
  • what happens when plants have a lot of water?

    guard cells fill with water and go plump and turgid - this makes the stomata open so gases can be exchanged for photosynthesis
  • what happens when the plant is short of water?

    guard cells loose water and become flaccid - making the stomata close - this helps stop water vapour from escaping
  • what are guard cells adapted for?

    for gas exchange and controlling water loss within a leaf