Transpiration And Osmosis

• What is the definition of osmosis?

  Net movement of water from high to low potential
• What does water potential represent in osmosis?

  Concentration of free water molecules
• What has the highest water potential?

  Pure water
• How does adding solutes affect water potential?

  It lowers water potential, making it more negative
• What is a partially permeable membrane?

  A membrane allowing only certain molecules to pass
• What happens in an isotonic solution?

  No net water movement occurs
• What occurs in a hypotonic solution for animal cells?

  Animal cells may burst (lysis)
• What happens to plant cells in a hypotonic solution?

  They become turgid (firm)
• What occurs in a hypertonic solution for animal cells?

  Animal cells shrink (crenation)
• What happens to plant cells in a hypertonic solution?

  They become plasmolyzed
• How can osmosis be investigated using potato chips?

  By placing them in different sucrose concentrations
• What is the definition of transpiration?

  Evaporation of water from plant surfaces
• What drives the transpiration stream?

  Transpiration creates a continuous flow of water
• What are the functions of the transpiration stream?

  Transports water, carries minerals, cools leaf, maintains turgor
• How does temperature affect transpiration rate?

  Higher temperature increases transpiration rate
• How does humidity affect transpiration rate?

  Higher humidity decreases transpiration rate
• How does wind speed affect transpiration rate?

  Higher wind speed increases transpiration rate
• How does light intensity affect transpiration rate?

  Higher light intensity increases transpiration rate
• What are stomata?

  Tiny pores on leaf surfaces for gas exchange
• How are stomata controlled?

  By guard cells that open and close them
• What is a potometer used for?

  Measuring water uptake by a plant
• How is water uptake related to transpiration rate?

  Water uptake is directly related to transpiration rate