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phschool/science/biology_place/labbench/lab9/xylem.html

http://www.phschool.com/science/biology_place/labbench/lab9/xylem.html. Daily Warm-up Monday, April 21 st. What processes help move water up a tree? HW: -Read 42.4 Turn in: -Nothing . AP Lab 11: Transpiration. Transpiration. Evaporation of water from aerial parts of plants (not roots)

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phschool/science/biology_place/labbench/lab9/xylem.html

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  1. http://www.phschool.com/science/biology_place/labbench/lab9/xylem.htmlhttp://www.phschool.com/science/biology_place/labbench/lab9/xylem.html

  2. Daily Warm-up Monday, April 21st What processes help move water up a tree? HW: -Read 42.4 Turn in: -Nothing

  3. AP Lab 11: Transpiration

  4. Transpiration • Evaporation of water from aerial parts of plants (not roots) • Relies on hydrogen bonding of water molecules and the processes of cohesion and adhesion

  5. What causes different rates of transpiration? • Number of leaves • Number of stomata • Size of the leaf • Presence of cuticle • Light supply • Temperature • Relative humidity • Wind • Water supply

  6. Adaptations for Reducing Water Loss • Leaf structure • Different photosynthesis: CAM plants • Cuticle

  7. Today’s Lab • Working in groups • Each group will receive one type of plant but must subject the plants to 4 conditions • Wind (fan) • Light (lamp) • Room temperature (away from any drafts) • Humidity (put within a bag that is misted with water) • Will record each day’s mass in table at the beginning of class for remainder of week

  8. Steps • Receive plant type, break into 4 separate plants • Place plant’s roots in bag of water with 20-25 mL of water. Tie the bag tightly so that no air is able to escape. Weigh plant and record in table. Each person needs to make a table and record the group’s data. • Set in proper conditions: fan, room temperature, humidity (bag placed over rest of plant), and light

  9. Daily Warm-up Monday, April 28th What type of graph might you use to display the change in % mass for each of the five days? HW: -Transpiration lab due 5/10 Turn in: -Nothing

  10. Lab Notebook • Title: Transpiration Lab • Brief introduction • Hypothesis- inquiry lab worksheet • Methods (no materials required) • Table • Graph- line graph- one line for each treatment showing change in % mass each day • Results- what did you find? • Conclusion- why did you find what you did. Make sure to explain findings and say whether or not hypothesis is SUPPORTED. Include potential errors and future research. • Questions from transpiration question sheet

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