Movement of water through leaves

Question 1

The water vapour lost by transpiration lowers the water potential in the air spaces surrounding

Answer 1

the mesophyll cells

Question 2

The water within the mesophyll cell walls evaporates into these air spaces resulting in a

Answer 2

transpiration pull(column of water pulled up from xylem

Question 3

This transpiration pull results in water moving through the

Answer 3

mesophyll cell walls or out of the mesophyll cytoplasm

Question 4

Movement of water through the cell walls of a plant is said to occur via the

Answer 4

apoplast, or apoplastic, pathway

Question 5

Movement of water from the cytoplasm of a cell occurs via the

Answer 5

symplast, or symplastic, pathway

Question 6

transpiration stream why does it happen

Answer 6

The pull from the water moving through the mesophyll cells results in water leaving the xylem vessels through pits (non-lignified areas), which then causes water to move up the xylem vessels to replace this lost water (due to the cohesive and adhesive properties of the water)

Question 7

When rates of transpiration are high the walls of the xylem are pulled inwards by

Answer 7

the faster flow of water

Answer 8

guard