7.7 Transport In The Xylem

Question 1

Describe the xylem

Answer 1

No organelles
Thickened with lignin
Made of dead cells
Long hollow tubes with no end
Moves water and ions

Question 2

How does water move through the xylem?

Answer 2

Diffusion out the stomata
Tension
Cohesion- H bonds

Question 3

What conditions increase the rate of transpiration?

Answer 3

High temp
Low humidity
More stomata density
Wind speed
Light intensity

Question 4

Describe how water gets from the root hair cells to the xylem

Answer 4

Apocast pathway- (preferred pathway) through the cell walls until it gets blocked by the casparian strip
Sympathetic pathway- through cell cytoplasm( gets blocked by organelles)