transport of water in plants

Question 1

what is transpiration pull

Answer 1

when water lost causes a negative pressure causing transpiration pull

Question 2

what does this transpiration pull cause

Answer 2

water to be drawn up from the roots

Question 3

what is the transpiration stream?

Answer 3

flow of water up the xylem

Question 4

what factors affect the rate of transpiration

Answer 4

light intensity
temprature
humidity
wind/air movement
water avaliablity

Question 4

cwhat is active loading

Answer 4

sucrose loaded into sieve tube element
h+ ions actively transported out companion cells
h+ ions diffuse back in briing sucrose with them
sucrose then diffuses down the concentration gradient

Question 5

what happens first during mass flow

Answer 5

assimilates loaded into the phloem

Question 5

what does this occur through

Answer 5

the plasmadesmata

Question 6

what does this loading of asimilates cause

Answer 6

a lower water potential

Question 7

what does this lowered water potential cause

Answer 7

water from xylem enters phloem by osmosis

Question 8

this influx of water what does it cause

Answer 8

increase hydrostatic preasure