Combined ScienceCode 5129
Transport in flowering plants
What this topic asks you to be able to do
- Relate the way root hair cells are structured to their function in taking up water and mineral ions
- Explain why these matter: (a) nitrate ions, used to make amino acids, which are needed to produce proteins (b) magnesium ions, used to make chlorophyll
- Outline the route water follows on its way through the root, stem and leaf, limited to: root hair cells, then cells of the root cortex, then the xylem, and finally mesophyll cells
- Describe transpiration as water evaporating from mesophyll cell surfaces into the air spaces, followed by water vapour diffusing out of the leaves via the stomata
- Describe translocation as the transport of sucrose and amino acids through the phloem from the sites that make them (sources) to the sites that use or store them (sinks)