Transpiration

• What is transpiration?

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

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

  Gas exchange and water loss
• What is the function of guard cells?

  To regulate the opening and closing of stomata
• Where does photosynthesis take place in the leaf?

  In the palisade mesophyll
• How does water enter the roots of a plant?

  Through root hair cells
• What is the transpiration stream?

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

  It brings water for photosynthesis and cools leaves
• 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 affect transpiration?

  Higher light intensity increases the rate of transpiration
• What happens to stomata during high light intensity?

  Stomata open to allow gas exchange
• What do guard cells do during hot conditions?

  They close stomata to reduce water loss
• What is the relationship between stomata and photosynthesis?

  Stomata open for CO2 intake during photosynthesis
• What are the key tissues found in the leaf and their functions?

  • Palisade mesophyll: Site of photosynthesis
  • Xylem: Transports water and minerals from roots
• What are the steps involved in the transpiration process?

  1. Water evaporates from leaf cells
  2. Water vapor diffuses through spongy mesophyll
  3. Water exits the leaf through stomata
  4. Water is replaced from xylem to leaf
  5. Water is drawn into root hair cells
  6. Water moves up xylem vessels to leaves