transport and exchange in plants Flashcards
what is a dicotyledonous plant
a plant that forms 2 seed leaves
what is a monocotyledonous plant
a plant which forms 1 seed leaf
what is a vascular bundle/vascular tissue made up of
xylem and phloem
what are some characteristics of xylem
no end walls
transports h2o and dissolved mineral ions
transports just up
contains dead cells (lignin)
passive process
what is the structure of the xylem (3)
dead
hollow
elongated tube
2 main functions of the xylem tissue
to transport water and minerals from the roots to the rest of the plant
to provide strength
the xylem contains cells joined end to end with no end wall, how does this feature contrbute to effection transport of water
it forms one continuous/unbroken tube which is essential for the movement of water by cohesion tension
xylem contains dead cells, how does this contribute to the effective transport of water
cells do not use ATP to move the water, the movement of water would be slowed by the cell surface membrane and cytoplasm of a living cell
xylem has thick walls containing…
lignin
how does lignin in the thick walls of xylem contribute to effective transport of water
it helps strengthen the xylem and prevent collapse
characteristics of phloem
transports up and down
transports sucrose and AA by translocation
sieve and companion cells
active process
what is the name of the main transport vessels in the phloem
sieve tube elements
what is the structure of phloem sieve tube elements
many cells joined end to end to form a hollow tube separated by sieve plates
what cells are linked to the sieve tube elements and provide support with metabolic activity y
phloem companion cells
products of photosynthesis transported in the phloem such as sucrose and amino acids are called
assimilates
