Transpiration

• What is transpiration?

  The loss of water from a plant
• What happens to water during transpiration?

  Water evaporates and diffuses out of the plant
• What effect does transpiration have on water uptake?

  It causes more water to be drawn into the plant
• What are the four factors that increase transpiration rate?

  Warm temperatures, high light intensity, good air flow, low humidity
• How do warm temperatures affect transpiration?

  Water molecules have more energy
• Why does high light intensity increase transpiration?

  Stomata open when it's light
• How does good air flow affect transpiration?

  Fewer water molecules surround the leaves
• What is the effect of low humidity on transpiration?

  Higher water concentration inside the leaf
• What are guard cells adapted for?

  Gas exchange and controlling water loss
• What happens to guard cells when the plant has lots of water?

  Guard cells become turgid and stoma open
• What occurs when guard cells are flaccid?

  Stoma close when the plant is short of water
• What gases diffuse in and out of the stoma?

  Gases like CO₂ for photosynthesis
• What are the conditions that lead to the opening and closing of stomata?

  • Open when:
  • Plant has lots of water
  • Light is present
  • Closed when:
  • Plant is short of water
  • It's dark