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Group the following statements about phloem into the following categories O F P S Position in plant organs Functions of phloem and processes that occur within and between cells Pathway taken by substances within phloem tissue Structure of phloem tissue including cell structure and cell shape No. 1 phloem tissue is between ‘arms’ of xylem in vascular tissue in root Category 2 transport of sucrose from roots to leaves 3 movement of hydrogen ions and sucrose into companion cell 4 phloem sap moves through phloem tissue in root 5 phloem sap moves through phloem tissue in stem 6 sieve pores in sieve plate 7 sieve tube elements have peripheral cytoplasm 8 carrier proteins in companion cell membranes 9 sieve tube elements have thin cell walls that are not lignified 10 companion cells contain mitochondria 11 transport of amino acids from roots to leaves 12 mitochondria provide ATP for active transport across companion cell membrane 13 on outside of vascular bundles in stems 14 on upper side of veins in leaves of dicotyledonous plants 15 phloem sap moves through phloem tissue in minor veins in leaf 16 sieve tube elements are stacked end to end 17 movement of sucrose between companion cell and sieve tube element 18 sieve tube elements are elongated 19 phloem sap moves through phloem tissue in petiole and main vein of leaf 20 phloem sap flows easily, there is little resistance to flow 21 plasmodesmata between companion cell and sieve tube element 22 hydrogen ions are pumped out of companion cell 23 sieve plates 24 sieve tube elements have no nuclei 25 sieve tubes form continuous columns 26 transport of sucrose from source to sink Match the structural features (S) of phloem tissue (sieve tube elements and companion cells) with the ways in which those features help the transport in phloem (F). Use the numbers from the table above. You may wish to use some of the functions more than once. Structural feature of phloem tissue How it helps transport in phloem