Topic 9.2: Transport in the Phloem of Plants
- Structure and function are correlated in the phloem of plants.
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. (1.8)
9.2 U 1 Plants transport organic compounds from sources to sinks.
9.2 U 2 Incompressibility of water allows transport along hydrostatic pressure gradients.
9.2 U 3 Active transport is used to load organic compounds into phloem sieve tubes at the source
9.2 U 4 High concentrations of solutes in the phloem at the source lead to water uptake by osmosis
9 2 U.5 Raised hydrostatic pressure causes the contents of the phloem to flow towards sinks.
9.2 A 1 Structure–function relationships of phloem sieve tubes.
9.2 A 2 Identification of xylem and phloem in microscope images of stem and root
9.2 A 3 Analysis of data from experiments measuring phloem transport rates using aphid stylets and radioactively-labelled carbon dioxide.
In The News
In The News
Alex Lee discusses Topic 9.2