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9.1 Transport in the Xylem of Plants

Understandings:
  • Transpiration is the inevitable consequence of gas exchange in the leaf.
  • Plants transport water from the roots to the leaves to replace losses from transpiration.
  • The cohesive property of water and the structure of the xylem vessels allow transport under tension.
  • The adhesive property of water and evaporation generate tension forces in leaf cell walls.
  • Active uptake of mineral ions in the roots causes absorption of water by osmosis
Applications
  • Adaptations of plants in deserts and in saline soils for water conservation.
  • Models of water transport in xylem using simple apparatus including blotting or filter paper, porous pots and capillary tubing.
Skills
  • Drawing the structure of primary xylem vessels in sections of stems based on microscope images.
  • Measurement of transpiration rates using photometers. (Practical 7)
  • Design of an experiment to test hypothesis about the effects of temperatures or humidity on transpiration rates.
Nature of Science
  • Use models as representations of the real world-mechanisms involved in water transport in the xylem can be investigated using apparatus and material that show similarities in structure to plant tissues.

Powerpoints
xylem_9.1.pdf
File Size: 420 kb
File Type: pdf
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Homeworks
xylem_homework.docx
File Size: 60 kb
File Type: docx
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plant_test_study_guide.docx
File Size: 74 kb
File Type: docx
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Helpful Links and articles
Shared Study Guide
docs.google.com/a/mpls.k12.mn.us/document/d/1X21SjrPSofxFz8_C2fOMyqCZq-AVyFzl4RA2i3Y8ytk/edit?usp=sharing
Virtual Transpiration Lab
Stomata Data
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