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.
- Structure-function relationships of phloem sieve tubes.
- 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.
- 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.
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