IGCSE›Cambridge IGCSE Biology›Mind mapsXylem and PhloemCambridge IGCSE Biology: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsXylemCarries water and mineral ionsMoves upwards, roots to leavesAlso supports the plantPhloemCarries sucrose and amino acidsMoves in both directionsFrom sources to sinksWhere foundTogether in vascular bundlesRoot – towards the centreStem – around the outer regionLeaf – in the veinsXylem, phloemplant transportXylem structureLignin in thick walls – strength and supportNo cell contents – hollow, unobstructed tubeNo cross walls – one continuous tubeWater pathwayRoot hair cells absorb waterThen root cortex cellsThen into the xylemReaches leaf mesophyll cellsRoot hairs have a large surface areaExam tipsXylem moves things one way onlyPhloem can move things either wayLink each xylem feature to its function