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Topic 9.2: Transport in the Phloem of Plants

Understandings:
  • Plants transport organic compounds from sources to sinks.
  • Incompressibility of water allows transport along hydrostatic pressure gradients.
  • Active transport is used to load organic compounds into phloem sieve tubes at the source.
  • High concentrations of solutes in the phloem at the source lead to water uptake by osmosis.
  • Raised by hydrostatic pressure causes the contents of the phloem to flow toward sinks.
Applications:
  • Structure-function relationships of phloem sieve tubes.
Skills
  • Identification of xylem and phloem in microscope images of stem and root.
  • Analysis of date from experiments measuring phloem transport rates using aphid stylets and radioactively-labelled carbon dioxide.​
Nature of Science
  • Developments in scientific research follow improvements in apparatus-experimental methods for measuring phloem transport rates using aphid stylets and radioactively-labelled carbon dioxide were only possible when radioisotopes became available.
​
Powerpoints
phloem_9.2.1.pdf
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