vascular system Flashcards
where is vascular tissue in
dicots
tissues in vascular bundle
xylem
phloem
sclerenchyma
collenchyma
parenchyma
function of sclerenchyma
support and structure
thickened with lignin an cellulose
strengthen stems and leaf midribs
function of collenchyma
found by epidermis
involved in growth
thick cellular walls, give strength
flexible support, wind resistance
function of parenchyma
soft packing tissue, fills spaces between other tissue
in roots, store starch
in leaves, have chloroplast and photosynthesise
aquatic, air spaces, keep plant buoyand
function of xylem
support, water/mineral transport up from root to shoot
structurally support plant
adaptations of xylem vessels
cell content decay, do not contain any cytoplasm/organelles, long hollow tube
end plates break down, unimpended flow of water
cell walls thicker than usual, withstand water pressure
lignified cell wall (spiral,rings/broken rings), waterproof, add strength, keep vessel open, allow flexibility
bordered pits, allow mineral ions and water to move laterally between xylem
stucture of xylem
made of dead cells
vessles, parenchyma,fibres
several columns of cells fusing together end to end, water and mineral transported in this tube
what are bordered pits
small non-lignified regions of xylem vessel walls
parenchyma in xylem
packed around xylem, store food, contain tanin deposit
transport of xylem
moves upward, transpiration, evaporation, pulling force, drawing water up xylen
function of phloem
translocation
transport of assimilates from sources to sinks, dissolved in water to form sap
up and down plant
structure of phloem
mostly sieve tube elements and companion cells
have parenchyma, storage, strengthen fibre
mature, contain living cells
sieve tube elements
line up end to end
alive
transport assimilates around plant
adaptations of sieve tube elements
elongated
no nucleus
little cytoplasm
tonoplast and other organelles break down
label a leaf
