Transpiration and stomata

• What is the transpiration stream?

  The constant stream of water through the plant
• What causes transpiration in plants?

  Evaporation and diffusion of water from leaves
• What happens when water evaporates from the leaves?

  More water is drawn up from the plant
• What carries mineral ions dissolved in water through the plant?

  The transpiration stream
• What are stomata?

  Tiny pores on the surface of a plant
• Where are stomata mostly found on a plant?

  On the lower surface of leaves
• What happens when stomata are open?

  Carbon dioxide and oxygen can diffuse in and out
• What controls the opening and closing of stomata?

  Guard cells surrounding the stomata
• What occurs when guard cells are swollen?

  The stomata are open
• What occurs when guard cells are limp?

  The stomata are closed
• What is the role of stomata in transpiration?

  Allow water vapour to escape from the leaf
• What is the question asked at the end of the material regarding stomata?

  Name the cells that control the size of stomata
• What is the process of transpiration in plants?

  • Water evaporates from leaves
  • Creates a water shortage in leaves
  • Water is drawn up from xylem
  • More water is drawn from roots
  • Continuous water stream through the plant
• How do guard cells regulate stomata?

  • Guard cells change shape
  • Swollen guard cells open stomata
  • Limp guard cells close stomata