Transpirtaion

• What is transpiration?

  Evaporation of water from plant leaves
• What factors affect the rate of transpiration in plants?

  Temperature, humidity, wind, and light intensity
• What are the roles of stomata in plants?

  Gas exchange and water loss
• Where does photosynthesis take place in the leaf?

  In the palisade mesophyll
• What does xylem tissue transport?

  Water and dissolved mineral ions
• How does water enter the roots of a plant?

  Through root hair cells
• What initiates the process of transpiration?

  Evaporation of water from leaf cells
• What is the transpiration stream?

  The movement of water from roots to leaves
• Why is transpiration important for plants?

  It cools leaves and supplies water for photosynthesis
• How does temperature affect the rate of transpiration?

  Higher temperatures increase the rate of transpiration
• How does humidity affect transpiration rates?

  Lower humidity increases the rate of transpiration
• What effect does wind have on transpiration?

  Wind increases the rate of transpiration
• How does light intensity influence transpiration?

  Higher light intensity increases the rate of transpiration
• What happens to guard cells when light intensity is high?

  They swell and cause stomata to open
• Why do plants close their stomata under hot conditions?

  To reduce water loss by transpiration
• What is the consequence of closing stomata for photosynthesis?

  It limits carbon dioxide intake for photosynthesis
• What are the key processes involved in transpiration?

  • Evaporation of water from leaf cells
  • Diffusion of water vapor through spongy mesophyll
  • Exit of water vapor through stomata
  • Replacement of lost water from xylem
  • Movement of water from roots to leaves
• What are the effects of environmental factors on transpiration rates?

  • Higher temperatures increase transpiration
  • Lower humidity increases transpiration
  • Wind increases transpiration
  • Higher light intensity increases transpiration
• What roles do guard cells play in regulating transpiration?

  • Guard cells swell to open stomata in light
  • Guard cells shrink to close stomata in heat
  • Regulate gas exchange and water loss