3.3 plant transport

Question 1

precautions to take when setting up a potometer

Answer 1

-set up under water
-use the same branch

Question 2

apoplast pathway

Answer 2

through cell wall

Question 3

symplast pathway

Answer 3

through plasma membrane

Question 4

casperian strip

Answer 4

impermeable ring around the cell (suberin)

Question 5

how does water enter the vasular bundle in the root

Answer 5

active transport of mineral ions causes water to follow through osmosis

Question 6

structure of xylem

Answer 6

-dead (lignified)
-lignin in cell walls
-linin can be spiral , full , annular
-boarded pits

Question 7

role of waxy cuticle

Answer 7

stop water loss

Question 8

role of upper epidermis

Answer 8

transparent so protects chloroplasts while allowing them to access light

Question 9

structure of the phloem

Answer 9

-living cells
-sieve plates between cells

Question 10

how is sucrose taken into the phloem

Answer 10

-H+ pumped out to create conc gradient
-cotransport of H+ ans sucrose in
-water follows via osmosis

Question 11

highlight the process of mass flow

Answer 11

loading of sucrose into the phloem lowers the water potential so water moves in via osmosis from neighbouring xylem and surrounding cells
sucrose is actively unloaded at the sink